Haven't had any taller than 4ft, most hit around 3' and the trellises I use hold them up/support them well, if they go sideways and can still support themselves I just leave them as they get better light that way anyhow, but I always have support with the trellises lower down which is usually good enough. You can look at tying them to the ceiling or simply add some bamboo posts to support them. That stuff Sativied shows in his pic looks like some flexible ties that come in a roll, I buy it at the dollar store for LST and have used it to tie the heavier colas to the trellises for additional support. It's all good though, not a bad problem to have
Looking good!
BTW: I was running out of trellises and can't find any around as it's winter here and all the gardening stuff is gone. I did find
these on e-Bay, they have them in different lengths, I bought 25x @30" long for $16 delivered to my door, just watch them and they go down from time to time, they're listed for $18.99 right now.