Are you venting your hot air outside from the output of exhaust fan(s)? Also, are you bringing in air from outside on the intake side? That is what made a big difference for me.
I am jealous of your temps. I live in Austin, TX and in the summertime it gets brutally hot here.
Yes, exhaust goes outside and intake from the outside as well, ducts are some 8 feet away from each other. I know TX is hot, we get some 115F here during the summer as well... but we get very cold winters, we had like 5F for some weeks last winter with snow and everything. I was running all my GPUs with just a few fans and a 2 feet window open, thats how cold it was.