I’m not a math person so for others who stumble on this, I’ll explain how I reached the conclusion for the values The default unity grid is 1:1 ratio hexagons.
To fix this I need to either scale up the vertical axis, or scale down the horizontal. I followed This site for the ratio which has the ratio listed as sqrt(3):2 so I got a unity grid size of (sqrt(3), 2, 1) or (1.732051, 2, 1) which I then reduced to (sqrt(3)/2, 1, 1) or (0.8660254, 1, 1)
Which makes them regular.
Hopefully this makes sense.