Why are my tomato plants curling up?

I grew approx 30 tomato plant (of the variety Money Maker) from core and 5 of these plants are now severely curling from the top of the plant in the middle down. Ive given away 25 plants and all these look fine but the 5 I hold kept which are now within pots and are starting to show the start of flowers resemble a cork screw hazel rather than tomatoes. There is no discolouration, no insects. Im suspicious that it might be to do near overwatering, poor drainage. The curling started after I repotted the five into 12 inch pots while all the others go away to garden homes and never developed any curling. Help!?

Answers:    poss over fertilization leach the soil with dampen and dont over fertilize
I live in Texas where on earth we are already in the 90's. We hold to put them in the cloudiness due to heat and sea every day. Miracle grow make a fertilizer just for tomatoes. I would meditate that they are getting too much sun, not enough dampen, and no fertilizer.
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