Enlarging PRP doesn't always help

PRH said

I just wonder how much help the steep top angle would be if it was that much shorter…….by not sinking the valve.
The transition area from the seating angle to the chamber wall wouldn’t be as “optimal”.

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I believe you are correct. I looked at the SM (15 deg top cut) and the Edelbrock (stupid 0 deg top cut) and since I can't weld worth a dime sinking the valves seem like the best option for testing. Look at any modern (racing) chamber and they all have wide top cuts. It's got to be good for something.