I don't want to be the bearer of bad news -- but it is IMPOSSIBLE to compress liquid ---- (think hydraulic rams etc - that's why they use it!) so ANY oil path that was created when leaking -- will continue to leak until you put a new seal/gasket where it's needed. You can tighten bolts til the cows come home and it will leak.
Check your vacuum source.... there is MANIFOLD vacuum and there is PORTED Vacuum.... which doesn't create vacuum until the throttle blades are opened. YOU want MANIFOLD vacuum.
With no photos etc nobody knows where you're pulling your vacuum source from.
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