You have a lot of pressure just from the weight of the razor. This pressure causes the grit in the hone to deform the edge more than a lighter razor because the abrasive particles get a deeper bite and warp the edge as they gouge in to the fin and down the bevel. This is exacerbated by the smile: even a slight smile means the hone is only touching the bevel at a very narrow range.

You're gonna have to compensate for this somehow. The 45 degree angle is one way (by giving the abrasives a slower glancing approach to the fin), simply slowing down your stroke (way down) is another, supporting some of the weight of the razor is another (angle the scales back a bit), and going to a slower hone (maybe boron carbide paper or chrome oxide paper on glass) is yet another. You can also use something that is more lubricating than water, such as a thin oil like kerosene, on your hone.