I took another curve out of the jig and put a new one in today. The curves are coming out matching up perfectly when I stack them on each other. Every curve has an extra tail of about 8 inches that makes a fine transition to a straight section and has a bit of overshoot so that I can mate curves together and still have a perfect curve.
I have switched from using wooden dowels to hold the spacers in place and am now using decking screws that are countersunk and then covered with a dowel that is glued in place. This holds a bit tighter and I think it will last longer.