I like mixing it up

, keeps things interesting.
Rather than 4 gap it all the way, which isn't a bad idea, I zero gap to the next sos weapon lvl, delevel to 9 gap and sp farm enough points to get everything I want at current lvl. Then SPEND to zero gap then lvl up to the next sos lvl. Rinse repeat.
Varies the gameplay a bit. Probably not the absolute best way to do it, but hell, this is a game and I'm having FUN
