Whether or not to use those seed is up to the individual, they can carry a tendency to hermie, but dont have to. I would try them, but only 1 the first grow and watch close! I have friends that are financially challenged, and I give them seed (I make some with certain strains like Rusty Glue)
As for the others I would wait until these are almost finished to flip
I have read so many different opinions on pollen, from 1 week off the plant to a year, IDK!!!
I dont use a tent, so IDK how to clean it,,,,