I like f1 crosses. Vigorous and fairly predictable after a few have grown. Youll see your phenos. Theyre not super stable but not all over the place either. For example, after smoking 8 different 1oz plants of the same strain, i still suffered some tolerance building. But they had 3 primary flavors, 4 smells, and 3 growth patterns. When taken to f2 you get more genetic variation than f1s.
But if youre say taking a couple same-strain f5s then youve made f6. More stable theoretically if you know what youre looking for in phenotype selection, or possibly a step back if you cross 2 different phenos.
And yes, 1 pollen at a time on your group of ladies. Anything more and youre definately dealing with oops crosses and unknowns. I personally only play with pollen every other run. So i get my breeders and if theres any stray pollen hiding itll come out in the next run. Then i can move on to the next project.
But thats because im terrible about cleaning my room thoroughly.
Good luck.