Free: Contests & Raffles.
Yardage judging is most important followed by accuracy imo. I really don't think your gonna be able to be pinpoint accurate with a 20 and 40 pin. Just get used to shooting the small gaps or get a slider site like an hha or get a dovetail extention for your site. My bow is shootin x-ringer hv's at 326, its fast which helps in yardage errors but I can also shoot it accurately.