I had a higher frontsight put on mine. Lever action rifles seem sensitive to load levels. Typically hotter loads shoot lower.
I suggest finding a good "service load" that is effective and accurate for your purposes, then do what you have to do to have it spot on. If for hunting, I expect you will be shooting at various ranges up to about 200 yards. For that, a spot-on sighting in range might be about 150 yards, then learn your holds. Your mileage may vary, as the saying goes.