arrow tuning questions

[laughing turtle]

I am attempting to achieve perfect arrow flight out of my new Treadway Black Swamp longbow 60" 47#@28" with Blackhawk 2000 shafts cut to 28.5" and 145 grains up front. I shoot right hand. Note that this bow is not cut to center.  At fifteen yards and under, i have great groups fletched and bareshaft, both windage and elevation.  Beyond that, the fletched shafts fly adequately but not great and with the bareshafts  I notice porpoising. When i go to more weight up front, bareshafts indicated weak spine, likewise with less weight up front i get a stiff indication.  I have modified my shelf to get the arrow directly above the throat of the grip to help eliminate torque.  When i shoot through paper, i get a slight nock high indication.  I shoot split finger, deep hook with a tab.  I have noticed a bit of soreness on my third finger so perhaps this is part of the issue.  Any advice, suggestions, etc.

[R H Clark]

I don't cut carbons to any certin length and then tune.Different set ups may require slightly different shaft lengths.I would get my shaft shooting a little weak with the point weight I want to shoot and cut 1/4 inch at a time untill my bareshafts were just enough weak that the feather weight would make it perfect.

It seems though that you aren't far off because you can change the shaft from weak to stiff with point weight.

You may be a little nock high from the porpoising and paper indication,HOWEVER, a high elbow and too much pressure on the bottom finger can cause a nock high if you torque the string enough.

[laughing turtle]

Thanks, i think you are correct on finger pressure.  I also brought up point weight and got more consistent flight.