I’d get a screw on point from 3 rivers archery. They have only 125 gr. Taper the end and screw the point on. Shoot at 15 or 20 yards so you can have time in flight to see which way the nock end kicks. It should kick to the left (right had shooter) which shows that it is weak in spine full length. Unscrew the point, cut 1/2 inch off. Taper shaft and screw the point back on. Shoot again. As you continue this process you will see the nock begin to move to the right. When it is flying straight then you have arrived.
I once decided to see if I cut more off could I get it to fly with the nock kicking out to the right. It did. So just for fun I glued a 145 gr point on and, walla, it straighted up.
In your process you should be cautious to stop cutting off once you approach your given draw length plus at least an inch for broadhead clearance. If the shaft is still kicking to the left, then go to a heavier point and so on until it straighten ups.
