Upon recommendation, I'm posting this in the feedback section. I think I may have found some bugs regarding EXP gain.
Details: The incidents in question were found while experimenting with the custom map feature, which I use to level grind thanks to the ability to make maps with 300% EXP gain. The incident was while in Land of Carnage (interestingly enough, custom map enemy levels don't increase but I suspect you still gain the bonuses for using LoC). I was using the current patch, so they could be patch related. I was grinding Adell (about level 200ish (no unique innocents, just rare ones you find through mediators, reverse pirates, etc) targeting level 1700 enemies in my own custom map (designed so that they face backwards to maximize gains for characters with lower HIT stats).
1. Kills inflicted while on a Deathblow geo panel do not give the attacker EXP, even when the geo panel is also an EXP bonus.
2. Like 1 before, but with HP/SP Switch.