Understand your thought but I can say it works the exact opposite in my grows. Larger volumes of water take longer to reach whatever temp your trying to stay away from. Once your heater or chiller is in action it would be very close to the same energy to get it there. Trust me it will cost less to cool 8 gallons every 3 hours than 2 gallons every hour.
And the nutrients are way less. You are not chasing PH adding salts. You will find your concentrations will go down because the amount is still their and they can absorb them just as quickly. I think you should look at DWC with MC like you would an organic grow. These aren’t chemical nutrients that we need to injest at the exact PPM to be useable. Lots of guys running 500ppm the whole grow with bennies.
Not trying to convert anyone just sharing.
I’ll be updating my post in New growers tonight, you should check out my grow.
FB