[S.J.SLEEPER]

I can't see a reason why it wouldn't make boost even with the chips in impeller. Did you check to see if bypass valve is stuck open?
As for the chips & seals leaking, that is complete b.s. that the company that did the work won't do something for you. You've documented the entire build here. that proves s/c was never ran since rebuild. I would pursue some sort of action with them. And I find it hard to believe chips in impeller were there when the recieved it and they didn't notify you that they were there. That tells me they did the damage to impeller when pulling it off to replace seals (if they even did replace seals) Those seals shouldnt be leaking already.

When I had the s/c, I had 11psi after the intercooler and no oil in my pipes. I think they did you dirty.
Dont give up on build, you have alot of time into it, and if you do the work your self on the s/c it won't be that hurtful on your pocket.