Besides correcting the eye relief, it sounds like you need a higher bench or rest, or a lower stool. A good shooter I know uses an adjustable stool from a drum set.
Our range has an old 100 yard range with wood floor and benches looking right into the afternoon sun. We also have a new 100, 200, 300 yard range with concrete benches and floor, and no sun problem. Nobody uses the new range because those pretty new benches are too short. You have to crawl the stock, risking scope eye and the top of your shoulder takes a beating from the recoil.
Or, you can change nothing and make sure the scope hits your face the same for every shot. Then you know if your grip is consistent! Of course, that only works until your eye swells shut. You need a cut-man in your corner.