Yes, your system is way unbalanced and your pouring practices are not helping.
All your CO2 is coming out of solution during the pour. Throw away your 3 feet of 3/8 tubing and get at least 6 feet of 3/16" restrictor tubing.
Next, reduce the keg pressure until it is stable at whatever carbonation level is appropriate for the beer style, the temperature and your tastes. It's probably about 12-13 psi off the top of my head. You have way too much CO2 dissolved in the beer, most of this will need to come out of solution which will takes a few days or maybe a week.
Once the beer is stable, and without reducing the keg pressure, pour a beer or two making sure that the entire restrictor line and tap are refrigerated. If not refrigerated, you will get lots of foam.
The restrictor tubing can be shortened if you end up kegging with less pressure.