Help need someone experienced!

I have a few questions...

1) Is 85 F too hot for my tent? The canopy fluctuates between 80-82.5 F. It cools down to 70-75 during the night cycle.

2) Nutrients, I have gotten by with my past two grows on using the three part GH line and kool bloom with beneficial bacteria. I am going for gold on this grow and would like to know if this sounds good for a nutrient line up.

Flora Micro, Gro, Bloom, Kool bloom from GH.
MycoMadness
Sweet from Botanicare

With the addition of Sweet to my line up I am sitting at 3% magnesium per part is this too much? Also is there anything I can add to get that sweet sweet dankity.
The strains are good so I am not too worried. Lemon Skunk, Hashplant haze, Mk Ultra
I will be adding more strains in place of the LS and HPH probably. I might keep the HPH depending on taste high smell but the reviews are a little shy on the taste and smell.

3) If I flower right after my clones take root approx. how tall will my plants be at the end of flower under a 1k watt hps?

Any other pointers on some advanced knowledge will be greatly appreciated.

1.) your temps are fine.

3.) depends on strain and nutes

Well nutrient line is posted. I am currently sitting at 800-900 ppm ph between 5.0-6.0 (Lol broken probe on tri-meter I am using a ghetto ph tester )
Strains currently in the grow are Hash Plant Haze and Lemon skunk.

Question 3 is weird I am not so much worried about how tall they will be as to how much they will yield, no fimming or topping atm I am going for speed might dabble a wee bit in LST if the approx. yield is too low. I got 9 babies 2 lemon skunk and 7 hash plant haze. Light is sitting about 2.5 ft above canopy if that makes a diff. I am looking for a generalized guess from someone who has tried the flower right after clones taking root. Like 7g per plant or 14g per plant dried. I got a lb off 6 babies on my last grow but those were vegged for a little while lol also had fimmed them once or twice so i had literally a closet full of plant matter and buds. This time I added the sweet which should increase the yield due to the carbs if I am not mistaken. Also I am using a fogger system for the whole 20 microbe instant absorption and oxygen factor.

+REP for any help!

If u are using CO2 u are fine. As long as u don't notice and signs of heat stress u are good to go.