Yep, this is the problem I had with my last sativa grow, I was tieing down branches right and left every 2 days for weeks, what a pain in the ass, I now have learned of a growth regulator called Paclobutrazol, this substance, when sprayed onto the leaves for a week or two, completely stops the stretch in its tracks, the chemical is in a few products;
and a few other brand named products, if I only knew about this stuff before!!!!!
BTW Paclobutrazol is perfectly harmless.
What did you dream? It's alright we told you what to dream.