20psi for 2 weeks = DEFINITELY over carbonated. You shouldn't need 20psi for more than 48hrs or so. If you're planning on setting it and waiting 2 weeks, then set it at the correct serving pressure for the volumes of co2 you want. To fix this, unhook the gas and pull the pressure release. Repeat the venting until you reach the proper carbonation level. If you still have foamy pours, then as mentioned above, adjust your beer line length. 10' of 3/16 works for most people.
Keg #1: Pink Panty Droppin Punch (Strawberry Blonde)
Keg #2: Yooper's House Ale
Kegs 3-5: Empty
Ferment #1: Redhook Blonde Clone
On Deck: MORE BEER!