I freeze in canning jars but fill them, chill them, and then freeze with top off or loose. Once frozen I tighten lids. That allows expansion. Only once had a broken jar it think it hit a counter hard when freezer was being reorganized.
There is an interaction between stone grit and blade angle. It's not one or the other in terms of importance per se. But in general I see the same as Atax where smaller angle seems sharper than finely honed bigger angle.