WC- If twice a day is too much add a remote resi and double,triple, whatever your volume of solution. One fish tank pump is all you would need. Pump from your remote resi to your system and do a gravity drain from your system back down into your remote resi. The water falling into the remote would help cool and oxygenate the solution and you could mix up a big batch of nutes that would be good for 3 weeks with nutrient enriched Ph adjusted add backs.

I have an 80 gallon resi that locks in the Ph I set it at and doesn't flux for 3 full weeks. I really like it.

If you want to cut your work a bit more you can get an idea of how many add backs you will need to do during the 3 weeks and fill a rubbermaid trashcan or what ever has a lid to prevent light penetration with nute solution and a bubbler stone and just scoop out your add backs as needed.

This will give you time to sit and stare at your plants like we all do.

Love -Jay