One way to stunt growth/minimize stretch is to pinch the topmost shoot, right?
I did that on two of my sour diesels that were, at the time, like 14 days after flip 'cause the "fake" lead stalk on both were just really, really getting outa control. One wouldn't bend over and the other went flat for the rest of that sessions lights on. When the lights came on again, that sucker was pointing straight up and flipping me the bird, lol. I'm now at 22 days since flip on those two and they've grown another 5-6 inches easy. Chopped my two Blue rhinos last night, prob 3 days to a week early, just to make room for them under the HPS so I can get on with my MH with some clones and a 8-ball seedling...and actually gonna try to reveg the blue rhinos as I effed up and didn't get clones like a dumby this last time. This is my third or 4th haul on the one Blue Rhino seed I got as a freebie and I really like this strain. Any hoots, my bet is if it actually stunts the stretch or not is probably dependent on the strain being grown and where along into the stretch one is...for me, it didn't do squat at the times for the strain I stated at least; and that's the only time I've ever even tried "super cropping" at any point in a grow. Hope that helps, if not, the good news is someone else will have input shortly I'm sure.