Kerf is my Moby Dick! Can't get it to be consistent on different medium thickness material

You know your projects better than anyone of course but a nicely fit finger joint with glue is indistinguishable from a pure friction fit, and it is stronger and goes together much more easily than a pure friction fit.

Light kerf adjust plus glue:

As opposed to pure friction fit:

You can’t tell the difference between the joint styles in person… my conclusion was that the pain of going for pure friction fits just didn’t serve me anymore so I changed my design workflow.