Thanks for the advice MD. Good stuff there. Didn't think about iron sulfate... been trying to think of different ways to get a little more iron in my diet too.
I will look into that more tomorrow.
I watered the gardens with the 1 cup of vinegar per gallon this evening. Interesting thing, in the 2 spots where the peppers aren't doing as good as the rest, the soil actually "foamed" in reaction to the vinegar.
So I took a quick soil sample from those two spots before the vinegar could settle in deep, got readings in the high 8's.
I'll try the vinegar waterings for this week, gradually tapering it off, and do the soil tests again over the weekend.