Watercooling help.

So i just got all my watercooling stuff in the other day and finally got it all in place and started the leak test yesterday. My config consists of the swiftech gtz cpu block, swifttech 220 rad, mcp655 pump, danger den acrylic 5.25" drive bay res and feser tygon tubing all 1/2" and PC Ice water. Anyway...i set it all up, started my leak test and i was getting white foam. I knew this would most likely happen because with my setup, it was very hard to get water in the entire system without some amount of air getting trapped. So i let it run w/o the cap on for quite a few hours bleeding all the air out. Its almost completely filled to the top with water atm. Now im to the point where theres barely any bubbles in the res. The trouble im having is if i drop the speed on the pump to 3ish, the water becomes perfectly clear in a matter of minutes but as soon as i bump it up to 5 again, the "foam" comes right back. I tried searching this multiple times and im sorry if its been brought up a lot. I'm at work so no pics atm but if there needed i can upload some in a few hours. Thanks for the help.