I am using 11 degree angle for the wedge which works well, good holding and easy inset/removal with a rubber mallet. I have made additional wedges of varying lengths and 1.5" width to hold smaller items in the existing pocket.
The extended ‘point’ from the angle extensions can be reduced, and I will do that in future ‘SpoilVices’, most likely as an arc. This would allow for a larger pocket also.
The current pocket was designed for a 2.5" x 3.5" blank, with 1" + angle wedges.