PRH said

Okay.
Interesting.
So at some point they decided the filled in flatter floor was better.

If they were untouched, you should have some meat to play with, but I wouldn’t try and duplicate the newer floor shape in the old heads.
I’d shoot for a slightly wider, slightly less rounded floor.
Guide boss could use trimming, size the bowl correctly.

What you’ve done is already a big gain...... so be smart about how to proceed..... and know when to say, “that’s enough”.

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