Nutes being solids like Osmocote? or mix?
If its mix, just mix one gallon at full strength, split that among 4 x 1g milk containers, dilute / top each off with water, check pH and adjust, and you now have a 1/4 strength mix in 4 x 1g containers. I’ve used the packaging recommendations as a starting point. My photos here are ok at those doses but the autos not so much.
You could do a flush, shouldn’t harm them. I had to flush alot in my first run as I dialed in nutes and finished ok. I also had a soil mix that was way too wet back then, so flushing was not as easy either.
Edit: ya didn’t hit them too hard or too early with the heavy nutes either… When that happens, your girls will be REALLY short (I have 5 here that are 12-16" tall because of an overdose of P/K in week 4). That overdose absolutely stunted them… Your girls are taller than my stunted ladies, so ya got that going for ya…