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That is a common misconception. A properly ground wedge will still have only a very thin bevel. I have a 9/8 Joseph rodgers wedge of which the bevels are almost invisible. Honing that was very easy.

There is a trick for getting decent bevels:

When you are grinding the razor, hold the razor on the flat part of your belt grinder, with the spine just a bit elevated so that you are not grinding...

That said, hardening O1 is nearly foolproof.

I've noticed the same thing. It makes sense.
With low grits, you are removing the metal as it heats up, and the surface contact is rather low.
With high grit belts, material is not removed, and the...