I have lots of instructions but they don't give any real measurements for the 1/4" other than use the set guide on the template. That stop isn't correct for my half blind dovetails. I thought that there should be a formula I could use to set the bit height/depth. None of the manuals say much about the mini dovetails. I was successful in through 1/4" dovetails using their depth guide.Welcome to the forum, Jaay.
Do you have the instructions for that model jig?