I've been having trouble with my serving pressure.
Did you get the pour you were looking for?
I have to say just increasing the resistance probably won't get what you're looking for. There's a sweet spot that keeps CO2 in solution throughout the serving line, and when the pressure drops below that you get "breakout" which will make your beer come out slow and foamy instead of fast and foamy. It can be maddening if you aren't aware of what's happening.
The tube on the end ought to be about 1/4" ID if I recall, which is bigger than your serving line, right? Was the faucet new when you got it? Have you taken the faucet apart? It's kind of tricky to get the side pieces lined up to go back together, so watch what you're doing when you disassemble. Make sure there are no obviously damaged pieces, anything that would make a bunch of turbulence as the beer goes through. If you haven't already, try pulling it wide open to pour, and shut it off somewhat abruptly, see if that changes the pint. I think they're really cool looking, so hopefully you can get yours working well. I had one for a while that wouldn't stop leaking so I gave up on it.