Nice FOV's JJJ. Data looks quite heavily stretched resulting in washout of the midtones. Not sure if you'll get the data back so it maybe easier to simply do a repro on them. More data would certainly assist.
Black point is too high (Figure 1), drop it with levels but you'll probably find the contrast differences become overwhelming. Alternatively, you can try a three point curve (Figure 2) which attempts to address the issue - in a poor manner I should add. The application on the original data would be better.
Keep at it.