Problem fix and plant looking amazing, Jut noticed some purple stems and leaf crinkel

The only thing I am concerned about is the leaf on the Second pic, and the last one has a purple and a green stems maybe nothing to worry about but any opinion and input will help. The rest look great, its been about 20 days on flowering. Let me know if the flowers should be bigger or are they on track.

The 4th picture is the hole plant its one plant..

in the last pic, that is a sign of heat stress, try and get ur temps down abit
purple stem is somtimes a sign of P def, and as ur early in flower, the plant is using lots of P, u need to get a decent nute with plenty of P in it

I started the grow using Canna but I just wasn't seeing the sturdiness so just the veg stage I switch over to Advanced Nut and everything has being coming back to life showing great signs of a great crop, My temp is about 77-80F regularly using 2 600w HPS with great exhaust but slower on the fresh air, only thing is this one is just getting so tall making it harder to move the light.. Suggestions?