Maybe all you need is to think a bit about your technique. Think "dead foot dead engine" but go further than that. Imagine that your active foot and your active throttle are attached. If you push the throttle up on your good engine you push your foot in on that side. If you pull it back, reduce your foot pressure on that side. The stick should be straight in you hands. If it's turned to the right, step down on the right rudder, if it's to the left, step down on the left rudder. Use your feet to keep the stick straight in your hands. Sit in a chair and imagine you have the controls in your hands and turn your stick to one side. Then push your foot out on that side and imagine the stick coming straight in your hands. Play this game until the muscle memory takes.
Everyone has a bad sim occasionally. Your horse awaits you.