So, I’ve done some investigation the past couple days and I’ve discovered my previous assumptions were incorrect. You cannot simply change the expdefs in the DB and have it translate to the new levels. You actually need to modify ps_game.exe to allow the xp defs to be loaded into memory correctly. Without the modification it will overwrite the previous level’s xpdefs starting at 61.
I don’t think you need to do anything client side to fix the graphics, I think it is derived from the xpdefs.
Bottom line, to be able to have correct 60+ xpdefs, you need to edit ps_game.exe to correctly load 60+.
Depending on how you run your server, it might be better to have 1-60 and adjust the stats.