I believe flushing to reset the plant during a lockout is the thing to do but that’s about it. At any time you use water to flush or feed it should be in the proper range. If not, you would do more damage… say you have a problem and flush with 8.5 ph water. When flush is complete it would be nowhere near correct ph in the soil then you’d be fighting back at it with proper ph mixing into higher ph and thinking it’s proper ph all thru… (sorry, stoned..lol) but it would be off. I am sure there is some calculator that can figure it out for you but don’t know where you’d find it. Ph thru the grow then you can rule that out when you have problems. As far as experimenting… go for it! Twist, turn, poke, probe… whatever. We wouldn’t have many things if people didn’t experiment.