I have been soaking for 10 minutes at 1525, temper twice for 2 hours each @ 410. I have not had them hardness tested but extensive shop testing of the edge seems to show good hardness. I shave little curls off a common 16 penny nail, if the same spot on the edge will do this repeatedly it is usually in the right hardness range, if it is soft the edge will usually roll over a tiny bit and will stop biting into the nail. You have to sharpen with consistent edge geometry for it to be of much value but if you have a few other blades of known hardness to compare with you can get a decent idea of where you are at.
Cru-Forge V seems to decarb at a faster rate than any other steel I have worked with, even blades that I have made from it by stock removal come out of HT with what seems like an in-ordinate amount. Almost fooled me on one blade, had me stressed out about my procedure for a day or two when the edge rolled under testing. If you did not grind a good bit off your test pieces before testing, you might take another .010 off and test again just to be sure.