I don't really set for curls. More so for body. But when I blow my roots, I attach a concentrator nozzle (with a very thin opening) to my blow dryer and hit only my roots (always applying heat protectant to that area). My hair is already dry; however, that quick shot of heat really straightens the kinks and curls (just like at a Dominican salon). If my rollers could be pulled taut enough to remove the texture and curly roots, then I wouldn't need it. My hair still holds its curl, but I wrap it up and tie it down.
The trick is the concentrator nozzle. It's the small piece (not the comb attachment) that attaches to your blow dryer. Most people have it and don't really know how to use it. And then again, the really good ones (really thin opening) come with really good (expensive) blow driers. I hold my hair, just below where I want to apply heat, with a round-brush and pull tautly. Apply the heat for about 2-3 seconds and go to the next. Roots are flat, hair had movement and body!
This is a good example of thin opening... The smaller the opening, the more concentrated the heat to that one area, the better the results. I've seen smaller. But this is a good one (not the dryer, the nozzle)
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Here's another good example of the nozzle...
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