I hope you can help me with a project problem. I am using my new Akeda DC
to make a wall hanging shelf with 1/2" poplar stock (final project will be
3/4" cherry).
Through dovetails will join the four corners and a sliding dovetail will be
the joint for the one shelf.

In my test piece, I have cut the through dovetails but I am having trouble
with the sliding dovetail. After fixing some sloppy setup measurements, the
shoulders (depth if cut) are okay but, the socket is a consistent, almost,
1/16" wider than the pin from top to bottom.

I am using the 11 degree bit set at a depth of 13/16" (9/16"+1/4"-- I have
ribbed guide rails and I want the joint to be 1/4" deep). I change nothing
on the router between each cut. The shelf is registered against two tail
guides with the housing joint template installed for the cut. I used the
front guide rail as the fence. The socket is cut with the boards in the
horizontal position. All cutters and the guide bushing are from Akeda. My
PC 690 does not appear to have bad bearings, the cutter and the guide
bushing are tight.

What am I missing?