93 MR2 3SGTE

Hi guys, have recently had my motor fully rebuilt as well as having the turbo high flowed - later model CT20b. Running 16lb boost.
 
At the track I get oil pushing up to the boost controller after a lap or so and finally blowing out the exhaust causing smoke and boost problems.
 
This only happens at the track. Any thoughts on what is causing this or a cure?   Catch can?
 
Your thoughts would be appreciated.