LDRXN controls caps the load. Not quite sure what you are asking really?

im thinking he wants to make lower a given load represent more power output..
i.e at 190 load the engine puts out 200bhp.. and there is no more room for tuning..
rescaling some maps and making the engine put out those 200bhp at say 150 load would give more room for tuning, but, what needs to be rescaled..

many people have done this, and might be willing to share some input.. id imagine there are many ways to do it.

starting with rescaling the MLHFM and dropping it say 10-20%.. will make the engine load lower.. but the engine will run lean.. since the air measured is more then the actual reading.. (this is what we want), so you would have to raise KRKTE and/or perhaps TVUB to compensate for the change(add the fueling back to compensate for the increased air)
i havent done this myself, yet, but this is definitely where id start.

then there are many maps based on load that might need some tweaking if you rescale TOO much.

oh.. just a hint.. the later me7.5 with wideband use 16bit variables, and its safe to assume it is not restricted to 191 load.. i tuned an audi s3 engine ending up on 234 load, and it ran happily up there..
..but for the older me7.5 this 191 load cap still applies in many maps, since it uses 8bit variables.

You have exactly same engine code as I have maybe your ecu is 4B0906018DC  by any change?

My ecu is 4B0906018DH, very similar