SM Head Modifications on a budget

PRH said

EA, I agree the sharp edge on the OD of that 15* cutter isn’t good.
I’ll be interested to see if there are any gains to come from putting a radius in the corner(clay).

The cutter I use for that relief cut is 20* with a radius on the outer edge.

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I even wonder if the vertical wall is good. In the 'what makes sense to me' category, I see a vertical wall better for low lift flow because of less shrouding. The inside radius and tapered chamber wall should help high lift flow. But the bench has a way of changing 'what makes sense to me'.