Hey Kid,
My opinion is those are some fucking HAPPY plants!!! Your MH light makes the plants appear a bit yellow but my plants are under MH right now and look just like yours. No burn, lot's of new growth everywhere. You are a great DAD!
Remember this is a marathon not a sprint and like below0 suggested is you need to try different things and see the results.
I'm in my new grow and I never go full strength anything. Start at 1/4, go 1/2, 3/4 to full. If anything looks bad, go back and flush, get everything neutral and stable and start back up to the point where things stayed happy.
Using this method, you can even "push" a bit. If everything remains stable at full strength for several days, start going up 10% every 2 or 3 days and observe until you find
your sweet spot.
Just follow the label recipes at first and once you know what you have, and you read a bit more, you can start experimenting with different formulas. It's kind of like being a chef.
It's kind of cliche but you'll "tune in" to your plants (it's all part of the therapy man
). Also remember "less is more".
peace