Since its only on the first set of leaves I wouldnt worry about it. But I will recommend to bump up the dosage for CaMg+ to 5ml or even 10ml. I use 10ml per gallon. It wont hurt your plants. Just dont go over 10ml per gallon. I use it on every feed. I go 5ml then 10ml and so on. So it could be that your not using enough CaMg+.Plus it has sugar cane and molasses in it so its 100% great for your plants.
The flushing amount is good. As long as you flush once a month your fine. Do you use hydrozyme? That breaks down salt build up in the soil and turns it into food for your plants, good stuff. I use this stuff like water. Every feed 10ml per gallon. Plus its full of B-1 vitamins for the roots.
As for feeding during flowering. Its up to you. You know how your plants react to feedings so if you feel like your plants can handle nicce amounts of nutes then go for it. I know this guy on here Jimmy Cricket he feeds his plants full dosage every feed. Plants come out nice. I tryd it once but then I backed off a bit. So its pretty much up to you and if you feel your plants can take what you feed them. Since your in flower give them 4ml of bloom once a week. See how they do. If they seem to take to it then give them 4ml every other feed. I would do it like that.
You been doing great with out any of this so I would continue to do exactly what youve been doing and take what you like from this and add it to your knowledge
