Here's a method I tried this year and it worked well.
Set your 20yrd pin at 20yrds and back up to 30yrd. Hold your 20 yrd pin on target and shoot a 3 arrow group. Now draw your bow at 30yds; aiming, align your 20yrd pin on target and set the 30yrd pinat the3 arrow point of impact. Shoot one more group using the 30yrd pin at 30yrd and make your micro-adjustment.
After sighting in your 30yrd pin, back up to 40yrds and repeat the process using the 30yrd pin.
It should save you some time.
g/l