rock and roll carbing is great. I do it all the time. but do it at serving pressure. yes 30PSI will get you there faster but it will also get you WAY over your target faster. set at 10, rock for 10 minutes or until it stops refilling. I like to hold my keg by the top handle and the bottom foot with the gas post down gas attached (never had suck back) and shift back and forth on my feet until the gas entry slows way down. It's usually okay after that but it's gunky and cloudy till the next day and the carb is better once it settles anyway.So do you only rock it for ten minutes, then set it back in the fridge? This sounds like my problem. I have been carbing at 30psi for upwards of 30-40 minutes, til their is no-more gas going in whatsoever.
yeah you are way overcarbed. think about denny's comment above as well but if you are shaking at 30PSI until no more gas goes in it's the equivelant of carbing at 30 PSI. I think the guideline for carbing at higher pressure is to fill the keg, take the gas off and shake, rest and repeat once or twice more. But I like carbing at serving pressure better.
The dispense tubing sounds too short and too thin to get a good balance.
wouldn't thinner line create more restriction and therefore need less length? I use ~4 foot 3/16 ID and it works fine 8-12 PSI (a little foamy at 12)