Jim, It looks like you need to adjust the position of the reference block screwed to the jig. As you can see from the sketches, moving the position of your piece drastically changes the size of the tail opening and the pins. Moving your wood toward the widest part of the Vee makes your tail gaps the widest and your pins the smallest. Moving your wood in toward the smallest part of the Vee makes your tails gap the smallest and your pins the widest, which seems to be what you ave done.
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