When I imported my character from SOA, he still had the slayer ability in place of his "child of Baal" healing abilities. Is this suppose to pass on? I thought I got my soul back from Irenicus but I can still turn into the slayer.

yeah, you can have that ability all through TOB, It isnt a bug.

I think when your soul is stolen then you get the slayer as a permanant replacement to your healing abilites. I can't remember if I got mine back, I played a ranger most recently so I used those heals most anyway.

I'll check again tonight and edit my post to make sure. But I think it is a permanant loss.

If you install the Bhaalpowers mod then you can get some healing abilities from the pocket plane tests. But you will lose your BG abilities permanently.