I wouldn't bend yet... I think you've got enough room left... most of my grows, when I only had a total of 60" in a tent, got to within a couple of inches from the lights. That being said, it will depend a lot on your lights, their strength and what the plant is telling you. I accidentally super-cropped in the late stages of flowering (my Tangerine Dream) and it didn't affect the plant... but it's not something I would intentionally do. But when push comes to shove, and you MUST, try it with only one stem and she how she reacts.. if there's no reaction, go ahead but don't do all of the stems at once.... that WOULD be too much stress.
Good luck!