nl bb auto was the best smoke out of a 75 plant run i just did!! your going to love it. I did have one pheno that is still budding 90 days from when it germed, still 100% white hairs but stinky and crystally as hell!! good luck. and you could bend the top over at 6 inches, wont hurt it a bit. i always just let them grow normal, never trained an auto.
and when i started some under a hps they were all messed up, the ones under the t5 were 100X better, healthier, bigger, more branching and everyting about them was better, the hps made them tiny, screwed up leaves, yellow tint, stunted growth,,,,, they really sucked under a hps for me. but i did finish them under a hps.