Every 5-7 days. With flexies it is usually 5-6. When I was running my pos controller it was 7 days. But, I use growth regulator so you get a deeper root so it can extract more water.
Yea, heritage g is the bomb, I use it when I need to but you need to alternate between different groups or you can end up with resistant fungi. Heritage is in group 11 which block 2 different biochemical sites so it is less likely to cause shifts, but you have to treat 2 times in a row (as you know)'so I also try to work in daconil when I can.
Edit: not trying to patronize you dental pain, just leaving this info for other ppl to pick up and research for clarity.