Not that you can find w/o disassembly IIRC. You probably just want to double check all the RPM limiters in your bin.

Find the one that matches what you are seeing, what conditions it triggers under, and if it correlates with what might be happening.

Yes. NMAXDV is the closest candidate I can find offhand w/o knowing more about your setup.

Did three more test runs today and RPM wall it hits is randomly different in each run. First run it revs up to 6250, turned around at the end of the road for another run - 5000, then again for one more - 5400. Does not look like soft limiter for me. At least nothing single value-like.
Will try to lower LDRXN and see what happens then.

The only code I'm getting is about crash signal from airbag, but that's because there's no airbags and CANbus in my car. Even after ~450km drive.
I got logs from all 3 todays runs. First and second runs are in v1 file, third is in v2. I advanced KFZW timing a little bit to see if there's any difference but it made none, so flashed back my previous bin. That should explain differences in ignition retard compared to my previous log. 
MAF readings looks ok for me, higher it revs, higher the reading goes, does not stop at the same value each time.
Ok, will not touch LDRXN.

I agree your issue won't be resolved, not even close, by altering LDRXN... If you made any changes to kfmirl/kfmiop you need to ensure that any maps sharing axis' with kfmiop have been rescaled to reflect the changes made. For example, if your kfmiop axis was something like: 9...40...72...120...150 stock and now because of the changes made in kfmiop, your kfmiop axis is now something like 9...59...96...147...189 you'll need to make sure that all of the maps sharing the kfmiop axis now carry the same values. Also, any maps sharing those values now need to be adjusted according to the new axis values.

Basically I think whats happening is that your reaching the highest load point from your stock file, and once you reach that load your ecu is now having difficulties figuring out where to go next. thats why your experiencing your issues at slightly different rpms... just a thought. nyet is far more experienced than me so I must disclaim to prevent you from making any mistakes or causing any damage due to my suggestions.

Also, what gear is this occurring in, I'm not sure if you mentioned that already.

Thanks for helping me out 
Here's my KFMLDMX map:

I haven't found MLMAX yet because it's a single value and I still have problems to find them if they're somewhere else than in bins I'm using to define my own. 
For testing purposes I increased KFMLDMX map, flashed it and did at least 10 2nd to 3rd gear WOT runs during the day. Two of them topped out at 6000rpm, all others went all the way to NMAX (6600rpm).I'll leave it like that for few more days just to be sure.
What was interesting for me, there was only one ignition retard event in one cylinder with this tune compared to my previous tunes. Maybe not a big deal, but still...
I haven't mentioned gear this is occurring, but it can be seen in my logs. It's 3rd gear, but it happens in 2nd too. Testing 1st is useless and haven't tried 4th because I don't want to lose my drivers license (even 3rd tops out at ~130kmph with 90kmph allowed, 50kmph on the road I'm using to test my tunes). IRL/IOP maps are untouched, I think I need some more reading to fully understand how they work before messing with them.
Log with modified KFMLDMX map attached

I'm back, and I have been doing a little work since my last post on August 29th. I was having A/F deviation problems and thought it might be my fuel injectors or some type of fuel pressure issue. I replaced my stock injectors with some EV14 550cc injectors, replaced my fuel filter/regulator (again), and inspected the fuel pump which looked good to me. The problem is solved! It seems the cheap filter (beck and arnley) I bought on amazon a few months back was defective and would cause me to loose fuel pressure as soon as I cut the engine off, which gave me hard starts every time. I just replaced with another filter (meyle) that was made in Germany and my fuel pressure is holding and I no longer have hard starts.

I can finally start working on the stage 2 thread, but I may have a couple questions before I go any further. My A/F requested is a sloped line and I would like it to be flat/horizontal. How would I go about making this happen? Also, I have a 2003 tiptronic trans and there may be a weird interference with pedal position, or maybe it doesn't affect anything... When I drive WOT I only push the pedal down until I feel the resistance on the throttle, Which if I press any further the transmission will shift down (even when in manual mode) and I can't get a good run in from a lower rpm. So maybe this affects throttle position even though it reads 100% when I log. I hope that wasn't too confusing...

Question #2: I am using us 93 premium oct and am still getting a ton of timing retard. I'm using the nefmoto stage1 timing map. I'm thinking it could have something to do with high IAT and I'm sure I am pushing my K03s close to or past its limits. Here is another question even though I bet it's related to the timing retard... My engine load is a lot lower than my requested engine load. I have a guess that the problem is in my KFMIRL and KFMIOP. I am including my most recent bin file and also my first log from today. I took 3 logs today but the results were all very similar. My car is stock with exception to EV14 550cc injectors and a custom intake filter/heat shield. Thanks for all the help so far and I can't wait to figure this out so I can move to stage 2 thread!

NOTE!!!!!!!! this bin file is a test and will cause stock fuel injectors to EXPLODE! made for EV14 550cc