Congrats on your bubba run. I'm just harvesting a test run right now.

I have bad news for you though, from your pics I can see first and foremost that they are WAY heat stressed. With that kind of heat I can't believe you are going to be successful with a bubbleponic with no chiller. Post a pic of your roots, I'd love to see them if you successfully beat root rot.

I think you should switch to soilless and you will be able to stablelize your pH as well.