Usually with router dovetail jigs one has to find the depth by trial and error as the fitting is very critical and any discrepancy doubles as the cut is on both sides of the joint.
I think you may have to play this game.
You will need offcuts of the same size as the finished work that are long enough to go into the clamps of the device and then just fit the joint by trial and error. It is the way we do it in the trade. Sharpening of the cutter and different thicknesses of wood all affect the fit of the joint.
If my memory serves me raising the cutter up toward the machine makes the joint looser and lowering it makes it tighter. If I was in my workshop with the machine in my hand I would remember for sure
Good luck!
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