I will have to look for pictures of the inserts.
The first one was a piece of aluminum angle. I showed it to an engine builder that used to work with some cup engines.
He talked me into trying shapes out of wood to see what the motor liked.Then changing them out for a metal version once you settled on one. He did tell me that it wouldnt be happy with the ridge or point.
Mine definitely liked a tent or teepee shape but the top does not need to be a point. Mine liked a flat or rounded top. I think the top of the point or teepee in mine now is about 3/4 wide with rounded edges.

My combo is a 540 wedge:
13 to 1 comp
roller 680 lift
Indy -1 345 cnc heads
modman with a pair of edelbrock carburetors.
4.10 gear
ATI converter
Its not a real aggressive combo.