Bending and tieing down is best done prior to flower or just as flowering starts. Once flower starts, the stems can be very brittle and snap quite easily as the the outter tubes of the plant begin to hollow out.

Also, the plant is set in its flower tops and bending can alter the light coverage on the flowers..which could be good or bad.

You would need to look at the possibilities.

If you still have a foot left, I would keep rotating it. Any growth after 3 weeks of flower is minimal and mostly girth as opposed height, although height will continue some what.

I wouldnt attempt to weigh the top top down....if you decide to bend it, which is fine, do it slowly, little by little....an inch or half inch per day. DO not over do it on any single day as a snap would throw it into shock and cease growth for a week or two.

Shitty pics are better than no pics