Allright Mate, have a look at my diary, I have 3 Sour Ripper on SCROG in the Box. The Señorita in the front is 10 days younger than the other 2. (One Seedling died after germination)
I just brought it up on the same height to the other 2. I installed the screen right after I changed to 12/12. But mine are Sativas, so the stretch, after changing light schedule, is bigger than at your Indicas.
Hope this will help a bit.
Cheerz and good luck with your Ladies...
Gams