I had a similar issue with mine, are you running a drip tank off the turbo? The other thing I found was the drain fitting I had restricted the drain outlet on the turbo and caused oil to back up in the CHRA. I found this drain flange designed specifically for the outlet of the S series BW turbos...
https://prlmotorsports.com/t3t4turbooildrainflangeportedo-ringd-10an-1.aspx
Combined that fitting with a drip tank I made and I haven't had an issue since (I do not run a check valve inline with the oil feed to the turbo):
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-Jayson
1976 911S Signature Edition - 3.2SSt (JE 98mm 9.5:1 pistons, 964 Cams, Carrillo Rods, ARP Head Studs, AASCO Valvetrain, 3.2 Carrera Manifold, ID725's, B&B Headers, TS HyperGate45 Gen V, TS RacePort, BW S360, AEM Infinity 506, E85)
IG: Signature_911
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