I love the concept of vile spirits, but are they too strong?

BTW, I have tried to take care of the power of player ghosts: There are checks in place to
prevent unseemingly dangerous encounters,
limit ghost powers somewhat,
make ghosts a rare and exciting but not totally unlikely encounter and
provide some early experiences with player ghosts.
Playing in the latest prerelease, I've encountered the same ghost in 3 of my 4 characters. Fels the uncaring, a dark elven ranger. She has a PV of 'far too much for a level <7 character to hurt' (elven chain?), drains strength on almost every attack, and does about 16 damage per attack. She's making it impossible to get past the extremely early game...