In the past I've had 6 or 7 pins, This year I'm trying something new. I bought a 3 pin HHA Slider, I sighted the 3 pins in for 40-50-60, 20 is just about 6" high. If I used my 40 without sliding.
So I can slide to 20 if needed for fine work using my top pin as usual or slide the bottom to 70 if needed ,I practice mostly at 70, shows your flaws really well
Sounds kinda cumbersome but I don't think it will be
6-7 pin set up got to be hard for me to focus on the target so I thought this might be the solution. Not sure if I helped you.
I havn't been able to try my new setup much yet
But excited to ....