ORIGINAL: Countryboy
It definitely needs to be re-centered. Judging by the first pic looking from the rear, it looks to be off center to the right and low. Plug the old holes with an appropriate size hardwood dowel using medium CA and re-drill to suit once you have cut & sanded the dowels flush.
Yep....fill, redrill and if neccessary I use washers/shims to get get it where I want it. I dont tweek on it too much.....good ol kentucky windage and go fly man!