WTF??? Do i need to go get a head and show you? You should be able to look at it and see what I'm talking about. It isn't hard. Do you have access to a flow bench? Do you flow your ports backwards? Flow at 40-50-60 inches? Flow at 10-15-20 inches? Do you actually test?
I'm telling you what I know, not what I guess. I never said don't mill a head. I've said don't deck the piss out of them and damn sure don't take the open flat out. Look at a W-5 chamber. That's a piece of **** and it's easy to jack it up.
I don't like to get the head below .060 on the quench pad. Maybe .050 if you don't run a 2.08 valve. As the valve gets bigger it makes it worse.
If I keep going I'm going to send you a bill.