Ideally I'd like mine with a slightly higher volume, closer to that of soda, but since I run the keg off the split from the same regulator that goes to the beer kegs, its kept at the house carb level of all my brews (what ever 13psi at 38F is). It's just fine like that, and as someone else hinted, without the proteins, you wont have excessive foam or head issues if you go higher.