Tiller is good, as others have pointed out. Shelf seems to be similar to your other bows so that's not the problem. It's simply a faster bow. Will need to learn how to compensate for it.
I don't buy the too old to remember stuff. I'm 70 and don't have trouble remembering I have to shoot one bow a little differently than another.
I agree with McDave. Raising the nock point will lower the point of impact. However, there is a point of diminishing returns with that. Raise it too much, and your arrow will start purposing.