If light leak has been 100% ruled out you might have an issue with your light cycle. If you're dealing with a bunch of wildly different phenos of a Haze variety then 12/12 might be too much light for one or more of them. Dial the light back to 11/13 or even 10/14 and see what happens. The problem with that is that some of the plants seem to be liking the 12/12 cycle just fine. I wouldn't rip them all out at day 60, but the plants that are barely budding 60 days in are probably a waste of time at this point. I would cut your losses with those.... literally.
Another possibility here is that your lights might be too weak (too far away from the plants), or too old. You might want to check them with a light meter to make sure that you are getting enough lumens.
When I experiment with seeds I typically put only one or two seed born females in with my other plants. Part of the reason is because I don't like unpredictable crops. Seeds are such a crap shoot and when I do grow from seed I end up being disappointed 90% of the time. That being said, I would rather have a crop with 14 clones that I'm familiar with and 2 seed plants that I know nothing about vs. 16 seed plants that could leave me with a pile of shit after 8 weeks, or whatever. I don't have time for that sort of thing and I think it's safe to say that most people here feel the same way.