I have foam factory grips on my older Murray Synergy mtn, bike and thinking about replacing them. The lever shifter on right side sticks out over the grip slightly. The grips I want to install are BMX type and have the molded "donut" end so the level cannot protrude over the grip.SO.......do I move the lever inward slightly OR notch out the donut? My thought is to move the lever but what about shifting ease since lever will be on back side of grip donut?