OK, maybe a stupid question, but I gotta ask. If I generally use 10psi on my keg and then add 2 more kegs and a co2 splitter. Do I still set the PSI on the co2 tank to to 10 psi to get 10 psi in all three kegs, or do I now set the PSI on the co2 tank to 30 psi (10psi x 3 kegs)?