Hi Alex,
Just saw this here. I regularly snap freeze spinal cord samples and store in -80 before sectioning. When I want to section I place the frozen sample in the croystat (usually it’s at -20 to -25 degrees C) and let it adjust to new temp for about 30 minutes. Then I embed in OCT by using a mold such as pipette tip with end cut off. Place pipette tip on one of the chucks and place the spinal cord sample vertically into the pipette and fill it with OCT. Usually works pretty well for me and morphology seem fine