Chucker,
"""Well, first, I guess I should say that I'm growing in SWCs. This will be my 3rd year in SWCs. The first year, I used miracle grow potting mix (
with the fertilizer built in)"""
Don't at all count on ANY beneficial fertilizer effect from that in the Miracle-Gro Potting Mix itself. Their NPK is something like .010-.007-.05. Virtually nothing, as is required for tomatoes. In my view, this is a Marketing gimmick by the Potting Mix Companies (Sta-Green does this too).
I would attribute your last year's results to mainly the poor weather, as you report. Give Tomato-tone another go, supplemented with Grow-Big, and later, Big-Bloom liquid ferts.
Raybo
