yes the engine builder has explained about hot spots even the valve seat needed to be smoothed off to remove a lip that was just proud.
Pic is not the best and the marks look bad in the pics but not to bad in person.
The ports do need some more work and i think that they are the easy bit, i just had a crack at them today but i am waiting on more of the flap discs to arrive so i can do as you say.
All up about 12 hours on the rotory burr and i did remove a lot from the exhaust side so hope to get some benefit from this. And equal flow i hope, has to be closer than the factory effort casting marks all over the place.
Will post some more pics when i get the ports done.