Cutting the top of my plants? Growing to tall

So here is whats going on I am pretty sure my plants are big for this little aeroponics system that I have them in, it is a 10 plant with Skunk #1 feminized seeds, So far I have 8 out of ten that are females, for some reason my tallest plants are females. They are exactly 3 feet tall and are 8 weeks and 1 day old; they have been into flowing for a week and 2 days. Advanced nutrients grow, micro, bloom, piranha, nirvana, sensizym with a 400w hps. Should I cut the top of the plants that are growing to tall to stop it from growing up, which I would keep as a clone. Any suggestions on what I should do?

you could try gently bending it and tying it down.

take pictures of your ceiling, is that really as high as you can go? if so.. fuck.. you should put them back into veg, wait 10 days , then cut off the top buds as clones and then put em back into flower a week after u take the clones This is a barbaric and relatively stupid idea (in my opinion), so don't do it unless someone says it's a good idea. I have no idea how that would effect things, but I'm not sure you have a choice. Putting your plant back into veg and taking clones to shorten it seems like the only option, the good news is the topping that'll take place!