Alot of windage problems come from the rear ring not properly aligned. When I mount any scope I too remove the bolt and center my bore on an object 75 to 100 yds distant, and check the crosshairs, if there is a windage problem I adjust the rear ring.
The OP said he "boresighted" the scope after mounting it, and it still wasn't on paper, this tells me it wasn't properly "boresighted". good luck.