Coming up out of posture during the downswing is a common fault created by a lack of strength in the glutes (buttocks), try stretching and strengthening them by lying on the ground with your knees bent and lifting your hips and buttocks off the ground for ten seconds
Although not a very pretty shot if you level your shoulders to the slope, aim left and walk through the shot it can be very effective
On difficult shots that have a lot of visual trouble, just trust your swing and let it go; this will eliminate tension and increase your chances of success