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You have a lot going on. You should get a very comfortable edge a 1um. At .3um the edge is harsh from excessive keenness.

It is not just about grit size; grit shape and substrate hardness play a...

Yup, you want Aluminum Oxide, not Diamond. Diamond is about 10 times the cost for the same performance.

AO film also comes in much larger sheets. Also do not buy PSA film.

Yea, 1um film is about 12-15K, but gives a more uniform stria pattern, than an equivalent stone.

A 1um edge is/can be a very comfortable shaving edge.

First get a good substrate, a Glass or...