As far as I remember, PEs gain dex xp at 80% that of spies. Their cap level is less than 80% total xp than that of a spy (something like 28m), so they actually reach cap faster. However they have the same xp level as everyone else for reaching WoC, this means they reach WoC much slower, especially since they can't use the higher TL weapons that grant more xp and kill mobs faster.

Setting PE WoC to 100m rather than 257m might be a good idea.