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Also will try another/better method of setting the angle.
Try chucking a test bar* - to give you an edge parallel to the centre line, then use a sine bar against the edge of your compound slide. If your compound slide has no reliable straight edges expose as much of the dovetail as you can (remove the slide if necessary) then use a rod in the V (make sure you use the none gibbed edge) to give you a straight edge to work from and a combination of 123 blocks and parallels to get it to the centre height.