So the last 2 beers I've brewed have no hop flavour at all. I've just switched to a fermzilla all rounder and am doing a closed loop transfer, so o2 shouldnt be an issue. I think the problem is with sanitation as I've been using a different no rinse sanitiser(chemsan) and I've checked the pH and it's just over 6 instead of under 3 where it needs to be so is probably totally ineffective. I would have thought I would still be able to taste some hop flavour, but there is none, does this sound right?