@EOINGROGAN It’s really easy to unintentionally tilt a rabbet plane. Lightening the cut means you can use a lighter hand, which can help. See if you are inadvertently keeping the plane tight to the work in a way that tilts the plane over. Also, you may be twisting the handle without realizing it. You could try not wrapping your fingers through the handle but just keeping your hand like a “U” with the fingers and thumb all pointed forward, just as an experiment. Also, is your clamp getting in your way as you move back and causing you to twist?