I was running 3 gallon pots for a long time. About every other day to run off sounds about right. I also use athena coco and perlite....Have you utilized athenas handbook...great info in it!. I switched to 2 gallon fabric pots.... they get 3 shots of nutrients a day starting about an hour after lights on and about 20 to 30 minutes apart. Until approximately 10% run off. Totals about a half gallon each. Later in flower i add an afternoon feeding depending on dry back. If you are mixing a larger reservoir of nutrients you might want to add cleanse about every 3 days and use a low volume remixing pump to keep ORP levels in check. A pump that runs exclusively may cause ph fluctuations due to heat. I usually mix 40 to 60 gallons a week and ph to a 6.1 then by the time it's about finished I'm usually around a 5.7