Pin under ring would be around 3-1/2 to 4 inches from your PAP which is way too strong if you want length.
I would place the pin 5 inches from PAP below fingers (which roughly puts the pin under the middle finger for you). To fine tune the reaction later, place the CG to leave enough side/finger weight for an x-hole (+3/4 ounces positive would be enough).
Adjust the surface for length. If you want to tame the backend, place the x-hole 2-1/4 inches away from PAP towards the pin, on the line from pin through your PAP.
Hope this helps..
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Regards,
Natal