Started from seeds in big pots,, should i top? PICS

This is my first grow. I started in 6.5g pots (wont be doing that again) and it's taking the plants forever. I'm assuming they will be huge, biggest is 21 in now, by the time there are alternating nodes...

I plan to bloom under 1000w HPS and need to fit these ladies under 4.5 ft from the floor ideally (18 in from the 1000w hood).

Should i train them or plan to top? They are feminized seeds.

3 diff strands under MH400 now.

So wait, why do you want to top them if you are providing them with 4.5 feet of grow room?

I would have trained them. Still not too late. But with this being my first lst I love it. Won't be growing any more straight ups . Especially in dwc