Most .22lr powder is done burning in a 16in barrel.

To experience an 8in drop at 100yds vs 3in would be the equivelant of that 36gr bullet with a rated muzzle velocity of 1260fps somehow falling to a muzzle velocity of under 1000fps. I seriously doubt that's happening.

There may be a bit of rated muzzle velocity loss, but I suspect the main culprit is your measured distances at the range or your sight over bore distance. Your numbers are suspiciously in the direction of an optic mounted low on an AR platform with no standard riser. Pics? Otherwise, the issue is somewhere in the measured distances you are using for zero or down field or both.