strain and situation specific question... purple train wreck

I have 4 of the ladies and they are 20" tall from soil to top after 5 weeks of veg from clone... i have from floor up 7foot but take away 9" for the hood and another 12" for the heat and finally 12" for the height of 3 gallon pots.. im under 2 -600 watt hoods and plants look good but only have another 28" if height in which to safely grow under... as this is a mainly Indica and faily bushy strain should I start flowering or allow more height first.. i understand every strain is different thats why im hoping someone with PurpleTrainWreck experience might have an answer here... thanks

I would flower soon, but if your plant does a little get too tall then you can always tie the colas down.

I grow purple wreck, my mother got up to 4 feet tall in a 3 gal pot. They grow extremely fast and fairly bushy. I am budding her out at the moment, I topped her down before putting it in flower, and made clones out of the main tops and an even canopy, so it sits at about 4 feet right now in the second week of flowering also in a 10 gal pot. It doesn't seem to be doing much vertical growth.

This is her in the middle:

Easily the biggest plant in my room. However this is the first time I have flowerd it so I dont really know what its going to be doing in the weeks to come.

wow that whole room is gorgeous... my plants are about half that size..closer to the size of the others in the room