Thanks for the responses guys, I'm not looking to see a set rules or something, however the "Thread starter makes the rules" rules of the program sometimes does get a big ambiguous about when you should actually make the frags that you put back into the program.
For SPS what I'll typically do is as soon as it's starting to encrust on the frag plug is when I'll frag plus that gives that added bonus of the base get light for a longer period of time.
For something like LPS I'll wait until I have enough heads to safely cut a couple/few off for the next person.