Hello Matt
I was messing with some files, playing again from warrior save file and saw weird info for spirits exptable. My Sleem is on 40lvl and it say for 41 he needs 45994exp, but in you`re arena.txt file in exptable 41st lvl is at 35380exp points. Same for Reaper he`s on 82k exp and for next lvl need 130k, instead 100k from exptable in arena.txt file . Is this because this string in logic.txt - spexp=0.5|1.0|1.15|1.3 (spirits need 30% more exp to lvlup then on normal mode ?). So far i never much paid attention on this files, and now i`m not sure if this is case.
Also when i finished this warrior play, and you asked if i got Reaper and Zerock to 46lvl near end game or not, i now checked their exp and both are 75000+ exp, so 46 lvl achieved long ago
I played with their exp gain from skills, and added all spirits 48lvl max, so they progress through all game and not get stuck on max lvl even before Haas labyrinth.
EDIT : I totally forgot impossible difficulty differences (duh) , thinking exp gain in battle is set to lover value, instead lvlup could be set 30% higher then normal difficulty settings. It`s all clear now