I think exp loss from death should match the exp level up table.
Exp loss at higher levels being 3% is extremely punishing. At level 70 losing 3% is a lot compared to 3% at even 65. It causes issues where people don't want to bring their mains to hard stuff where there is a chance they could die.
Lind for instance would be an easier sell to get people to go if exp loss was in line with the exp required to level. As it is, if there is a high chance to die people either don't want to go or will only take lower level alts.
In pvp people might keep coming back more instead of calling it because of deaths.