Controlling the stretch can be challenging, it was especially challenging in the RDWC but this is what I do. Heavy defol the day of the flip, leaves seem to give then extra energy to stretch, strip the leaves and they focus more on making leaves than stretching. 

I give them less N for the 1st 2 weeks, that cuts back on the energy to stretch and I start craning up on the PPFD at the flip. by week 3 I have the LEDs at 600 PPFD up from 2-300 at the flip. Seems like they are less likely to stretch if they dont need to reach for the light. Bud pinching seems to work also. I think its on Grow Weed Easy. 

The most important thing to learn is Super Cropping just in case,