Well, I seem to have made a pretty big mistake. Even though 20 feet of hose does a good job of restricting the flow rate, I forgot to consider that there's still 50–55 psi coming out of the end of it. And the Cobra picnic taps just aren't made to deal with that kind of pressure. (Don't ask how I found that one out.) So now I've got a half-full keg of knockoff soda and I don't know how to dispense it. I'm guessing the standard tap faucets can contain the high pressure, but I don't have a place to mount one of those.
Umm. You may have 55 psi in the keg, but the pressure at the tap should be significantly less by the time the soda travels the 20 foot of hose.
I haven't had ANY issues with my root beer keg and the cobra tap, and this keg has been more or less full and dispensing for at least 4 years.
I don't think I'm at 50 psi, but it's got to be 40+.
Maybe something else is going on. Especially since you say your pour is inconsistent and goes in fits and spurts. Perhaps something is restricting the flow in the keg. Are you sure the dip tube is clear?
You also might try pouring into a pitcher (or growler) and see if it settles down after the first pint. I believe that all of the soda in the line will be at somewhat of a different pressure than the soda in the keg. I find with all my kegs that the first pint pours somewhat foamy and then the pour settles down.
Bottom line, if you've got issues with the pour you will have the with a Perlick faucet just as you have them with a cobra tap. The faucet is not/should not be the issue.