Best thing I find is to ignore pack size and simply sort by seal scroll amount, if you have common attendees, trying to keep there scrolls balanced out between each other as best as possible, I never give anyone a pack 3 weeks in a row, usually give packs to the top participants each week, giving ones who did all rounds first, while never giving them 3 packs in a row.

Theres no best way as people will never really attend EVERY gnw everytime, so it's impossible to perfectly balance them, just do your best.

I keep track of mine with googlesheets.