That could have been the result of something silly as simply not parsing buffs with and without using discs. Among other things like well the fact that when Luclin shipped almost the entire original team had by then poofed. Doesn't surprise me that when handed an already overly complicated and finicky pile of code that had just been revamped in huge ways(AA's for one) that the lack of institutional 'vision' would cause once bugs now to become features. Features to bugs.
That doesn't really get into stuff like shit look at this
https://i.imgur.com/I7gap6A.jpg
OK we have base AC but who is to say there is not an ExtraAC, ExtraDefense. Gonna go with my gut and trust a druid on this. Yuck.
http://www.eqemulator.org/forums/showthread.php?t=40543
Anyways agility going from 75 to 255 seems to be without running a stupidly long parse 2.5-4% more misses. Is that worth it? Considering what some will do for item upgrades of similar marginal value then yeah why the heck not?