Gary, as one of your shapes has a cusp, its size will be far smaller than the spacing between each step at that point of the blend.
You therefore have to adjust the Attribute and Position profiles to balance the smearing away, even at 999 Steps.

The usual and better alternative is to make the smaller pointed end a thinner but longer shape aligning along the blend.
As you are talking about a cusp, there is no shape to tweak so I would add a small Line width of the same colour as the Fill and try that.

Acorn