A very likely possibility is that you seriously overcarbed your beer. I know it sounds counter-intuitive, but overcarbonated beer will actually taste flat, because when it's poured the excess CO2 comes out of solution forcefully, taking a lot of the other CO2 with it. This usually results in a lot of foam and a small amount of flat beer once the foam settles. When using a "burst carb" method rather than the set and forget carbonation method, people usually either agitate/shake the keg at serving pressure, or increase the pressure to ~30psi for a day or two without any agitation. Shaking a chilled keg for more than a few seconds at 30psi is an almost guaranteed way to overcarbonate your beer.
All that being said, it's going to be tough to judge proper carbonation level unless you are pouring from a balanced system, and as mentioned, 2-3' lines are way too short. The short lines are only going to exacerbate any overcarbonation issue you might have, and will probably give you somewhat foamy pours even with properly carbonated beer.
I'd suggest getting a 10-12' long 3/16" ID beer line and seeing how it pours. If it still pours a lot of foam, you'll probably need to de-gas the keg until the carb level comes back down.