Make sure you keep with the same type of ammo and weight or you will be all over.
I would move your target out to at least 50 yards....myopen sighted rifles I normally sight at 75. I use a piece of posterboard with a mark centered to sight with...it accounts for significant variance.
You mention that you are using a shooting sled, so that should provide consistency. Next I ask, are you wearing good hearing protection? amazing how gunshots will make us flinch unvoluntarily, moving our shots.
Like everyone else has mentioned....you move the rear sight the direction you want your bullet to go.
Next, I have to ask, what is your sight picture? Are you shooting for a mark covering it with your front sight? If so, you are shooting blind, which doesn't help.
You should be holding the top edge....the very edge, at the bottom edge of your target dot. That gives you a fine shooting point. Aim small to miss small.
I replaced my rear ramp sights on both of my (pre-64, 1950s vintage) model 94s with a Lyman aperture sight. It allows much better instinctive sighting, easier adjustment, and both of mine had factory drilled holes for the sight. You may look into that. It is one of the absolute best and cheapest ways to improve the shooting of a 94.