Red/purple stems. Topping. HELP please!!

I a have two problems. Here it goes:

1. Both of my plants have red/purple stems. I first noticed minor red/purple coloring about 3 weeks ago. I read online that this was due to a nutrient deficient deficiency. So I kicked up the nutrients from 100% strength to 125% strength. This did not cure the problem, so I kicked it up to 150% strength. I have not noticed any significant improvement. One is a white russian and the other is a AK-47. They are in 3 gallon pots with soil under a 250 watt metal halide. The temperature fluctuates between 74 and 84 degrees and the humidity is around 30%. I spray them every day and water every other. What is wrong? (see pics)

2. The other problem I have is that the plants are getting close to the reflector. (see pics) They are currently experiencing minor browning from the heat at tops with contact to the reflector's glass. These are mother plants, should I top them? How do I control their height?

Thanks for your time.

1) Some strains just have purple stems. It does happen as a deficiency but I cannot remember lack of what. Cool it on jacking up the nutes. You may do more harm than good. I would flush those extra nutes out. I have had plants with red stalks and stems from the beginning, water them when they need it. Wait until it dries it will give you better root development. Sounds like every other day is too much. Pick up a pot with dry soil in it so you can tell the difference by weight once you figure that out I am sure it is not every other day. I like to spray daily too.
2) Ever hear of Low Stress training? Get yourself some pipe cleaners or something you can use to tie on weights like nuts fishing weights etc. You can hang the weights on the tops and branches training them to bow their heads.
Go light at first. You can also tie them down or supercrop them.
wb

bump it up to da top