"Toller" wrote in message
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Snip


Well, when I dry-fit it, there still a gap I can't get rid of; the gap is
uniform all across, so my cuts are good.

How do your joints fit with out the biscuits? The cuts/angles can be dead
on correct but if your parallel sides are unequal in length the joints will
not close.

If the joints close properly with out biscuits, adjust you cutter to cut a
bit deeper and closer to the inside of the joint.