I've uploaded a crop from the middle of one of the 32bit images I am working with:
https://www.hightail.com/download/bX...Nkd6NEpESjlVag
If you click Auto STF (with channels UN-linked) and copy that to Histogram Transformation you get a very nice result. And the Auto STF deals nicely with any variation from frame to frame left after calibration so that I get a consistent set of images which renders to video nicely.
Trying to set target parameters in Auto Histogram to achieve the same result has proved beyond my capabilities!
Phil