I Said Never Again, I Bought Hedman Headers... Again.

I've never even heard of that.

Cutting the flange between the ports allows each newly created section of flange to snug up to the head surface independently.

I can see in the OP's pic that the tubes extend past the flange toward the head surface.
Some more than others.
Thus it appears a perfect candidate.

Do the OP's headers have a slip tube?
Did I miss that?

I've never owned headers with a slip tube.