Issue while boosted

Patchezz

(///_-),.I..
Hey guys, this may be a simple problem but I'm a bit stumped at the moment. I have a 98 integra that's running 19lbs of boost. The issue I'm running into is that when I get above 5lbs of boost my clutch goes flat and I can't shift unless I let the car run with a vacuum instead of a boost for 20 seconds. Now I figure air is getting into the system and when I check, the resovoir is full of fluid. It's an oem clutch master cylinder with an act heavy clutch. Any help would be appreciated!

On a side note I've bleed the system a few times now and when I do there's no bubbles
 
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