Thanks to all who have responded; got late last night and went to bed.
The Miracle-Gro 18-18-21 has .50% Mg, .05% Cu, .10% Fe, .05% Mn, .05% Zn. As mentioned prior, mixed at 1/2 Tsp. per gallon of R.O. water in a one gallon milk jug (well cleaned). I do not see any undisolved crystals in the mixture; give a shake every time before use. I've always had good results with M-G in the summer when the plants are outside and planted. If there are better recommendations, I'm all ears.
I will heed the advice and only bottom feed from this point forward. The started trays are still on heat mats and I have to mist water them everyday. They seem to dry out constantly. I'm using Sunshine LP5 plug mix (water retention seems to be medicore) and have the seedlings under 6500k FL for 18 hours a day. Should I scale back on the time?
The advice from Burger is to continue feeding on a once a week basis to work through this. As for the excess watering issue, if I don't water daily, they wilt like crazy (especially the annums that are just coming up). The chinese are a little farther along and are holding up better.
Thanks in advance!