not sure where/how that is calculated, but it probably does have something to do with the base sizes here. I do know that collision is a little funky in that for PCs anyways can walk like halfway through an ogre, he has like a little square in his belly that you lump over.
what i can say for sure is:
a gnome warrior jousting an ogre warrior, or any race, each will have the same range to hit eachother and use whos hit box is bigger
gnomes have same hitbox as trolls
human/highelf/erudite/barbarian casters have a slight advantage over others when kiting melees, ogre casters are at worst disadvantage
changing this line (specifically the NoZ part) will prolly get rid of 100000 feet high swords
Code:
if (DistNoRootNoZ(*other) <= size_mod)
trolls are worst pvp race
and that the newer eqemu hitbox formula is basically the same story