Hey Mike
I suspect that you do not have the vacuum that you need...In order to debulk your gonna need to pull absolute vacuum...or pretty close anyway...it appears your only getting between 15-16" of mercury I doubt that will do it...Depending on the viscosity of the materials you may get away with slightly less than absolute vacuum...

I believe that most epoxy laminating resins are 600 - 1200 cps...I have debulked much thicker materials...casting resins, sealers, urethanes, paints. All ya need is pressure...lol

I don't know what sort of equipment you have...make sure your system has no leaks...good luck...

Chuck