Nice work on the scales. It is surprisingly easy to reverse a pattern on a set of book matched scales. Mark the insides of each scale before cutting, then glue them together and shape.

Make sure of the orientation before you cut.

Lead is the traditional spacer material for horn scales. You can buy 1/8-inch lead from hobby stores, for sail plane weights. Glue onto a stick with double sided tape or one of the scales and shape on sandpaper. Just takes a few minutes.

You should re-shape that heel before you put it on the scales. The Stabilizer is probably responsible for the heel hone ware and the uneven edge.

Bring the edge corner forward of the stabilizer.