don't need to flush, ever.... studies show that it does not decrease mineral content in buds neither does it hurt taste... in fact in one study, ppl prefered taste of the non-flushed buds, but relying on personal reports on such things is very .. meh. That's how you get "4 of 5 ppl though their skin looked younger".. no, they are more embarassed tehry bought snake oil and don't want to admit it, lol, because there's no such thing as a fountain of youth in existence.
You basically just toss water on your supersoil with minimal additives? If you wanted, you could increase how much runoff you get to leech out some nutes. Again, i'd only worry about that if you have some overt toxicity showing or burnt to crisp leaves etc... Then, it may be needed.
As long as there isn't too much water retention, shouldn't see overwatered plants (droopy AF). With enough perlite or similar, shouldn't see it occur unless watering for an excessively long time beyond what it takes to saturate with a little runoff. If it droops like crazy from normal irrigation, just add a little more perlite next time to same volume of supersoil.