Should I up on the bloom nuts at this stage? Also ...

It could just be the heat thing... especially if it's really dry outside. Think of yourself outside on a hot day in 29 c weather with no shade. If it's humid you don't dry out and it's not too much of a problem cause the plant will draw the water it needs from the air.. But if the root system can't keep up and the air is dry, it can wreak havoc on a plant. Even if the roots have plenty of water the plant simply can not draw in the water it needs.

Hey friend, I think giving them a flush was a good idea, but i was wondering if you're checking the ph? The spotted leaves make me think of a cal-mag issue, and often that's usually down to the ph being off or not giving any additional cal-mag supplement. With taco leaves, getting them out of the outdoor heat will hopefully fix it up some, and maybe moving the hid light a little higher up will help too since they run fairly hot, or possibly more ventilation or additional fans to cool things down. It's not too late to fix any problems and i agree that you'll still manage to harvest some decent buds. Good luck with the problem solving.✌️