[David Jerome]

Rx7 store sells a restrictor and a feed line kit for a very reasonable price last time I checked. You can also use the factory boost restrictor pills if you get creative. I would just buy the kit from rx7store. I have had this problem with larger turbos in the past. There is very little exhaust pressure at idle from the rotary for these big turbos and it common to see oil go shooting out the turbine/exhaust side of the turbo.

With it being a new turbo, Im fairly certain a restrictor will fix the issue for you.