I just tested this last week with a level 9 job. You lose the same amount of exp no matter the strength of your moghancement when you homepoint, at least when using 6 Brass beds and taru.folding screens. I didn't test how it worked with Raise.
Data:
Amount: Overwhelming Faint None
StartExp: 2247 1779 2019
EndExp: 2019 1551 1779
Loss: 228 228 240
From here
LINK
It’s not the same post I saw a year back but it’s the same jist. Wiki’s page has some great info on enhancements
LINKY
If I remember right, don’t specific enhancements like “experience” show up on your key items? If so wouldn’t it be easy enough to see if more than one enhancement shows up on your key items?