I have a mill that has a minimum gap of 0.025", I will attempt to mill the GNO first at that setting without the rest of the malt.
I was wondering exactly the same about whether to use 500gr flaked oats and 500gr GNO or just 1Kg of GNO. I guess I will try with 1Kg GNO and see how sweet it can get. I usually mash between 68-70C for NEIPAs.
0.025” is what I used, and I think i ran them through twice.