A few questions:
1. Are you hitting those speeds on public roads?
2. What made you think you were sucking oil out of the engine?
3. Why did you disconnect the PCV system? (At high engine speeds, where is the increased volume of "oily byproducts", generated by the crank flying through the oil, going since there is no vacuum to open or close the PCV valve?)
I can see the advantage of disconnecting the PCV system but if you left the stock PCV valve in place then all that byproduct is trying to force its way up and out of the valve cover. If you don't want to get a PCV valve delete plate then you can gut the stock PCV valve (See sporadic's first turbo build thread).
New Ride: 2004 SVT
'10 Ford Escape 3.0 V6
'86 XR4Ti ; 2.3L Turbo, 15psi
1988 F150 Custom
'07 ST ; formally bewst'd - R.I.P