Looks to me like you can start bending, just make sure leaves aren't resting in the soil. Not sure what kind of LST you are shooting for (all spread out, circling the pot, bent), but I find that if I let it get 6-8 inches tall and bend over once, the bushiness fills in my space almost too well, and that's with 4 plants in a 2' x 3' cabinet. With all those plants in that tent, don't get too carried away.