This is the thread I was referring to where the OP talks about smoke on the left handers that got me wondering about the scavenge pumps, especially on bank 1. I know installing incorrectly is easily done and was going to suggest checking since it is easily determined if installed correctly or not. Apparently incorrect installation was the problem and could be an issue with this one as well. The thread attached shows how to identify. Hope this helps.
Huge Smoke Screen From My Boxster At a Track Day