I definitely agree that the 8th level perk of the feat should be retained indefinitely, it does not seem like one RPly that should come and go with levels. I've personally never played one, but I have cringed many a time when RPing with someone who did have the perk built tons of RP into the 8th level perk and then suddenly and without explanation beyond "I almost died and somehow regained some of my personal identity in the process" lost the power and had to find some way to explain the loss without breaking the RP.