I have a bob too, slightly longer at the front (back is about bottom of ear level, front an inch longer), no bangs (have a cowlick too). Works well when I straighten my hair or leave it to go curly naturally. I can pull it up for the gym or use a headband. I also have it thinned, but that is done at the end after it has been dried/straightened.

I don't own a hairdryer (need to get one, keep on forgetting!) but do own a straightener, so when I do straighten it, it is dried with a hair towel and left to almost dry naturally before it is straighened, I just top-up the straightening every day or so if I'm keeping it straight. Currently it has been straight for nearly a week, with the cold I have at the moment I might wait until the weekend to wash it & let it go curly.