Jason, I don' t think that you could use the existing severe helical with a prong style rest. You will get contact no matter how you orient the nock.

To lessen the effect of my own vanes, I' ve got the spring tension on my prongs set to VERY low.... so low that the prongs won' t support the wieght of the arrow while the bow is at rest. They do spring up while drawing the last few inches, because the prongs only have to lift the point wieght basically. I also use a string loop to minimize the effect of pressing the arrow down if my release was clamped on below the shaft.

Any chance of finding a jig with less helical offset? this might be the only solution until you can get a dropaway...

Jim.