Okay, so i`ve narrowed down my searches. Issue seems to be due to my fueling thats getting capped out.
I`ve installed an AEM AFR gauge and at WOT & high speeds, AFR goes down to like 9.3:1.
This is because of my BTS fuelling. I`m hitting relatively fast the 940 Grad C in FBTABGM and my min value in KFLDBTS is 0.75. So its following that from like 5500rpm in 4th gear.
But i left KFDLBTS active which comes into play aswell and lowers the requested lambda way more than the 0.75 that the car sensor can read.  (i`ve saw like 9.X:1 values on the AFR gauge).

How do you guys advise to proceed further?
1. Deactivate KFDLBTS (0 out the table, BTS fueling will only follow KFLBTS, req lambda no lower than 0.75...so enough fuel to avoid the issue of fuel starvation). But i saw in a post of prj, that is strongly inadvisable to run without this protection.
2. Improve the ignition angle efficiency (detazwbs) to avoid triggering KFDLBTS. But i dont know much about this...
3. Mess with EGTforPartProtection to avoid triggering FBTABGM in the first place.
This are the only options that come into my mind, if there`s another propper way to do it, please let me know!

I`ve attached a set of logs with my current map.

I`ll keep updating, maybe someone else needing help is as stupid/stubborn as me and finds my struggle usefull
Aiming for a constant 0.82-0.84 lambda and a minimum of 0.76 in worst conditions, tried a new improvement in the map:
-massaged KR tables (KFLAMKRL high load value increased from 0.825 to 0.84)
-massaged BTS tables (lowered KFLDBTS values a little, lowest value of KFLBTS is now 0.775 lambda)
-rised the high load /over 3000rpm values of KFZW a little ( 0.75 - 2.25 more)

Results are positive:
-EGTforPartProtection follows the same profile as before although AFR is higher overall
-acceleration feels smoother
-max IDC in wot 4th gear is 90%
-previously found issue (hesitation at high speeds) not encountered anymore so far.
-however, i got -3deg timing pull on cyl2 right after spooling point which i guess its ok, i only want to improve the time/steps it takes to recover from it.

Next thing to tackle:
- BoostPressureDesired low point at about 3500-3600rpm
- BoostPressureActual oscilations from 2750rpm(e.g. in these logs) to about 5000rpm
*i want my boost to be more liniar, to fill those holes in the picture attached.
Can you guys guide me further? What should i check in order to fix the 2 points above?

Log all boost PID values.

you don't need the adaptation locations (mxa) but ya, those.

There is something very wrong with your Q2 term, it is completely cutting out, causing a big spike in wgdc when you need it most

hmm no, not needed..

I'm assuming Q0 and Q1 are also stock?

I'd start by increasing Q0, try 25%, 50%, 100% and see what happens. It doesn't look like there is enough P, and there might be too much I

Might also need a bit more Q2, not sure why it is cutting out entirely but some more before the cutout might help