Sounds good. I don't know if it is because I am a plumber and work with water all the time, but I find hydro incredibly interesting, too. It sounds like you have put a lot of thought into your setup and I personally can add few suggestions at this point.
Keep your T5 as close as you can to the tops of the plants without burning them. As the plants get bigger you will find that you can put the light within a couple of inches of the top of the canopy.
While you may think that 91 and 33% are hot and dry, some of us deal with high nineties, sometimes triple digits and 15% humidity. I pull cool air from my crawl space and run my flowering lights at night. As you are not going to be flowering until we get into fall, you will probably find that outside air will be cool enough to keep your space within parameters. Depending on where you live, you may even have to add a heater during the dark period. Most of us use a passive intake--I have never found a reason to add a fan to the intake.
Have you considered starting a journal? This helps not only you, but future growers who come along.