Possible causes of foaming:
1) The beer is coming out too fast. The warmer or more highly carbonated the beer is, the more the CO2 wants to come out of solution, and the slower and more gentle the pour needs to be. The best way to slow the pour down is using smaller diameter or longer beer line. With 10psi serving pressure, 10' of 3/16" ID line, and 40° beer, this shouldn't be an issue.
2) The beer is carbed to a level higher than the serving pressure. You implied that you carbed using the set and forget method at 10psi, but didn't mention it implicitly. How did you carb the beer?
3) Gas is entering the beer line. This is almost always a result of an old and cracked or deformed liquid side diptube o-ring. I've also heard of very rare cases where there was a pinhole in the liquid side diptube.
4) The tower, faucet, shank, and/or lines are significantly warmer than the beer in the keg. Usually this only causes foam on the first pour of a drinking session. The cold beer flowing through will chill things enough to get a good pour until it sits long enough to warm up again. In rare instances, the temperature stratification inside the keezer/kegerator is great enough that it causes several foamy pours before cooling off enough to pour well.
5) Improper pouring technique. When pouring a beer, the faucet should be opened all the way in one swift motion. Opening the faucet partially will create a restriction that will knock CO2 out of solution and cause foaming. The glass should also start out tipped, allowing the beer to slide gently down the side of the glass until the liquid level gets high enough to be able to gently pour into the center of the glass.
6) Dirty glassware. Glassware that's not cleaned and dried properly will have water spots on it that can become nucleation points for the CO2 to come out of solution. Rinsing the glass with cold water just before pouring a beer will often eliminate this issue.
7) Restriction in the line. This can be hop particles stuck in the keg poppet or between the diptube and the bottom of the keg, ice crystals forming in the line where it's sitting too close to the cooling coils, gunk built up in the faucet, a tailpiece gasket improperly installed, or a simple kink in the line somewhere.