Ockenfuss,
I switch back and forth between a 20 & 24#. The 24 drops the brass about 4-6' away and the 20 throws them about 15-18' Depends on how far I want to chase them and if I'm in a spot where retrieveal could be a prob. Haven't had any malfunctions with the 24 being too strong, but for my particular setup (sounds like yours is extremely similar) I think a 22# would be perfect, brass not too far or spring too strong. 24 is a PITA to get in, that's why I tried a 20. Don't have a 22 yet or that would be my 1st choice. I use ISMI springs exclusively. Not saying that Wolf or Wilson are bad, I just personally like the mileage I get from ISMI's. YMMV, but try heavy first and then move lighter. A spring is cheap insurance, so don't under-spring to start out.
Check out the mods that are recommended before shooting alot. EGW flat bottom firing pin stop and extra heavy duty firing pin spring. There are other things, but I'm drawing a blank at the moment. They've been discussed at length here so do a Google and you'll be OK.