I do not know that model but I think the arms are pulled up by the lift rods and they are splined on to the upper shafts. If you moved the arms 1 spline it would lower you arms, but I have never done it. Second idea If you made up a custom bracket where the lift arms connect on to the lower lift arms that would also lower the arms. I like my second idea best as it is the least intrusive.
Craig Clayton