I was able to change exp from killing monsters. Not sure what exactly worked i just changed every single xp_per_victory in scripts via hex editor to my test value wich is 150. So now when i choose 150% (value 15 in scripts) the real value is 1500% (150 in scripts) and it worked i got 10x more exp
The problem is i tried doing literally the same with rx_monsterhpratio. I change every single value i can find in scripts to 1500 (10x more than 150% in game) and it's sort of worked but not really. The problem is when i start new game only Xardas have his HP pumped up ten times more but every mosnter/npc have normal HP. There must be something more in scripts that i should change. @Liker do you remember maybe what else in scripts do work for monsters/NPC HP values?
i found also rx_applymonsterstats but seems like changing monsterhpratio here also dont work
SOLVED! Finally

somehow i didnt change hpratio in rx_checkloop thats why this dont work. Now everything is fine i still not sure if its needed to change every single value but this is what i do. No time now to check but maybe rx_checkloop is only one that really need to be changed (xp_per_victory also need to be changed here). Anyway if somebody will need help with changing this values (or basiclly any other value in scripts, i also changed MAX HP or MAX STR) via hex editor then read this
i found this tutorial in worldofgothic and it saved my ass. Its not exactly tutorial to change value i searched but if u read it u can basiclly find any other thing u wanna and change it in Hex Editor. U need DecDat!
GL & HF all!