Ok, the "head" is likely coming from the CO2 in your lines, you can get "head" in about 5 minutes if that's all you want.. I am guessing that you simply havent carbonated long enough OR you have a leak in your cornies. Test the pressure on the corny keg by putting soapy water around it with 30lb's pressure on it. You ideally want to see no bubbles..., some light bubbling and light leaks are "OK" but will slow down your carb process.... It usually takes me well over a week to properly carb, I keep mine at 12-15 PSI @ 32 degrees (Yes, I like it cold) constantly...... If you have leaks, it will take more time to carb... There is always more carbonation in the line than in the keg as it is the escape route for the gas, so this is probably what you are seeing.
Here is a solution for you (besides the stupid shake at 100PSI method, which I disagree with)... While you are cold aging your beer, put it in your keg freezer under 30 PSI and disconnect..., this pressure will dissapate and disolve in the beer. Put another 30 PSI in it(and disconnect), it will disolve again... You can tell it disolves by pulling the pressure release valve. After 2 times at 30 PSI, put your desired PSI 12-15 on it and disconnect daily... You'll be pretty well carbonated by the time the beer has properly cold aged.