80F in the root zone/water temperature? I think that is a bit high.Imho with coco unless using large pots to avoid watering often with no perlite its just to much to hand water. Imho this method will give the best results bit that does not mean that other methods don't give good results.
Temperature of the rootzone is going to play a very big role. 70-80f i would say are acceptable for high growth rates with the higher end being more beneficial. This also has an affect on the amount of water taken up. There are several things that go hand in hand with making coco growth as good as possible and this is only one aspect.
You can find good articles about the root zone temperature and it should not fluctuate too much. The roots can't adjust to the temperature like the leafs can. If im wrong im sorry.
With an automated watering system you can keep the medium/roots at a perfect temperature and this will increase the root mass and also the nutrient uptake.