I made an Ash bow last week. It took more set right away than I wanted to see. So, before any finishing , I brought it home and sort of levered it over the kitchen island with the other end under the dishwasher and "toasted" it with my heatgun. I had some REVERSE STRINGFOLLOW sprung into it while I worked. (Note: all the aformentioned appliances plug into my Pre-Columbian 120V outlet in the kitchen)
It browned it up a little. It seemed to lift the grain a little. I took it back to work the next day, final sanded it and doped it up real good with my oil mix. After that, I thing the pull is about the same, but the "set" has not returned to it's previous level.
In retrospect, I probably should have toasted it longer, and let the heat get to the middle. And, a simple clamping system might have saved me standing there and holding it till bedtime.
piper