A higher front ring will not shoot lower. My advice is get some newer rings lower than what is on the gun now. Also perhaps try another scope and see if its the mounts that are to high. My bet is something happened to your scope, and it probably be easier to replace it than fix it. Optics sometimes wear out/break and replacing it is normal. With detachable rings you can always keep it as a memento and hunt with something a bit less dated.