There's your problem.Patrick I'm using 3/4" stock.
I'm pretty sure that set is made for 1/2" stock and not 3/4".
https://www.amanatool.com/49642-carb...nch-shank.html
That link lists the cutting height at 1/2" for the 49642 & 5/16" for the 49640
& looking at your picture - it sure looks like it's a 1/4" mismatch.