Ok, so I’m a 5-gal dwc, you’re going to use roughly 4-gal each for your weekly flush/refill. In a 1-gal jug, add the maxi for all 4-gallons and do the shaking thing I described. Then when you fill your bucket, use 3 plain gallons and then the 1 maxi gallon. Then add liquid nutes directly to the bucket, stir, and ph to 5.8. I can’t emphasize enough that you want the powder completely dissolved. It’s strong stuff and will burn your plant.
You’re setup sounds a lot like my 1st. You’ll want more light. I started with a 600w led and went to a 1500w for flower. The 1500w seemed a little much. @bob31 understands lighting way more than I do. Maybe he can chime in.
I followed the gh nute schedule, but only at 50% strength up until the last 3 weeks, when I bumped up to 75%.
One important thing to note, critical actually… calimag. Go a little heavy on that. Not more than 100% or anything, but more than your other calculations. I always just round up a little. It’s just gut instinct at that point, but dwc seems to run calcium/magnesium hungry so I go a little heavy-handed with it. Remember too much is as bad as not enough. Worse really. You can always add more. You can’t take away.