firstly, reduce your lighting by half. 2wpg is pretty plenty, anything more than that and your gunna have huge issues very fast if something isnt right, which it obviously isnt...

then, get a drop checker and use it with reference 4dKh solution, when it goes green, your on the money. Counting bubbles for co2 is no way to know how much you have in there, and neither are test kits unless you have lab facilities.. you MUST make sure your co2 is in good order or nothings going to get better.

learn about estimative index, your not dosing a complete package for the plants, so their going to be limited by ferts, possibly by co2 as well.

remember the cycle, light drives co2 uptake, co2 uptake drives nutrient uptake, that then provides growth.

right now you have MASSES of light, possibly very low co2, and your missing some nutrients, like the PO4 and N your not adding.. so your limiting your plants ability to grow in a number of different areas.

make sure you have alot of surface agitation, an airstone isnt going to do half the job as a good ripple 24/7. Also, when your plants are growing nicely and are pearling like mad like they should be, your O2 levels in your tank will rise due to the increased activity of the biomass, so your fish will be happier with it.

your high light and high temperature both mean that if your going to get an issue, its going to accelerate out of control very fast, halving your light is going to slow the whole system down, which will make it easier to identify and elliminate issues as they crop up.