| I see #2 as the only right answer here.
Consider that there is one perfect spine per length and draw weight of a bow. So the best results will come from having the best matched spine and bow weight (given your draw length is a constant)
If your spine is incorrect for the poundage on your bow that leaves you with 2 options
1) Change your bow's speed to get the correct speed for your arrows (This is done by adjusting poundage or string thickness)
2) Change arrow spine
Best tuning method I have seen for recurves is
1) Set centreshot down the centre of the string. Set plunger rock hard (swap spring for matchstick)
2) Shoot group then bareshaft
3) If bareshaft is to the left increase poundage, if to the right decrease poundage
4) once grouping together get your sights sets so you are hitting the middle of the target
5) set the centreshot just a little outside and set spring tension to medium
6) shoot group and bareshaft again, adjust cushion plunger to bring group back into the centre of the target.
What you are doing is setting the poundage to the arrows so that they are matched perfectly.
Then you are moving the centreshot to improve clearence on the arrow rest and the cushion plunger to do it's job. The cushion plunger is not there to counter poor spine selection, simply to help prevent poor shot hitting the rest etc.
It's fast, easy and provides excellent results indoors and outdoors.
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