Being you have not provided your setup specs, any attempt at troubleshooting is a guess.

If you are shooting aluminum shafts, it appears that you may now be slightly over-spined, especially if the spine was originally borderline.

Try adding some draw-weight in very small increments, and test shoot each change to see if your groups starts to move back to center. If it does and you end up with a draw-weight greater than you want to hunt with, try a shade-tree adjustment. Crank your limbs back to the original setting and move your rest to the left in very slight increments. If moving the rest does not correct the POI, and you do not want a higher draw-weight, you will have to add broadhead weight.

As I said, just a guess not knowing your specs.