..... A canted blade can wreck a shooting board.
In that case you need to make a better shooting board. A canted blade is exceptionally useful on a shooting board or off it.
A shim should be reliable. I would use one of those digital angle gauge boxes on top of the work piece to check the angle is consistent.
Regards from Perth
Derek
I wouldn't bother at all about consistency - if you look at the OPs drawings the angle are all going to be sightly different. I'd bother about how each piece fits against the previous one. Don't measure/gauge anything - just look at the fit.
No need for digital gadgets when you've got eyes. :lol: