Like I said earlier I usually keep my bareshaft slightly weak and yes the shaft leans a LITTLE (nock left) in the target. Adding fletching will stiffen the arrow and if I make and error shooting it is either drawing short or a poor release both causing less energy to go to the arrow, so the slight weak shaft helps compensate for my poor shooting. If your bareshafts are nock left quite a bit your to soft. need to shorten a little at a time. Make sure you set the nock point first as it effects the arrow also.
I recently tried adding a little electrical tape (weighing it the same weight as three 5" shields) and wrapping it around the rear of the bare shaft and tuned so bare/taped and fletched shafts hit the same/both straight. This is my first experiment with this and it seems to be working fine with the Axis shaft, going to tune some MFX an CX Heritage next and try this again, just to make sure it consistently works with different carbon shafts. If I remember I will take pics as I go and post for you. Just waiting for the MFX's to show up.