I have 4 ww autos growing in ffof. They are under a 600w mh lamp. I’ve had a lot of problems up till now and they are a bit stunted. The room is set up way better now. My plan was to try some lst for the 1st time but now this morning I noticed a couple white pistals on 2 of the plants. They are about 30 days since popping through soil. Is it too late to try lst?? Also, I can change the bulb to hps but don’t know the right time to switch it. I’m guessing I’m in pre-flower stage?