Initial timing set @ 30*. Engine seems happy?

Double checked everything. One mistake I made was @ 30* the idle is sitting at 600.

I brought it back to 22*. The idle drops to 520, but it still idles fine and fires on the first crank.

Should I try advancing past 30* and see if I can get the idle up, leave it at 30*, leave it at 22*, or try backing it even further off?