I guess I'm the opposite of keep it simple........

I shoot the exact same set-up I use in 3D competition.

23,28,33,38

Sounds nuts, but I spend soooooooo much time staring at those pin settings that any other yardage on those pins and I'd be a mess.
I know EXACTLY where each of those puppies needs to be out to 40 yardsthat it's second nature to me.
For my tastea simple 20-30-40 deal isn't precise enough.....but that's just me.