Hit the 45 with a stone to widen it up a bit, hit the 30 to bring the outer edge in......probably only sink it .010-.015 or so.
Must be no one believes I know what I did with that head.
I believe that there was a head with this done to it. . With a 60* below the 45* and a seat width of .059 to bring the 30* back up to the chamber would make it noticeably wide, like a quarter inch, which would be noticeable even with valve in.
I have Serdi cutters used in a Bridgeport. I have made errors where I have made the seat to great of a diameter, much less than .050 and it takes a considerable cut to reduce the Dia.
I believe and follow your knowledge but for that head to have been brought back to 2.200 I would think would stick out like a sore thumb.
but for that head to have been brought back to 2.200 I would think would stick out like a sore thumb. 
