Tburt:
Use the English Tying Joint, or one of the other solutions that bring the principal rafter into the top of the tie, which is at the same height or above the plate. There is not nearly enough relish, IMO, for the joinery to resist the thrust on an 8:12 roof in VT, nor does the tie appear to be doing anything to keep the plate from going out. Your 2x8 rafters can still provide an overhang and you could add a sprocket to the principal rafter to provide one. However, unless this is an unheated and uninsulated building, timbers should not penetrate the insulated envelope in your climate, and the eaves should be formed by the SIPS or other insulation matrix.