I Need some help and advice. I have a S&W 15/22 with a Vortex StrikeFire red dot scope. I am trying to zero the scope in and it is driving me nuts. I am shooting off a table and a Caldwell Matrix rest at 20 yrds. I will shoot let's say, high and to the left 5 in. I move the scope low and to the right. It brings it down, low and to the right, but not as far as it needs to go. So I move it just 2-3 click it the correct direction to try to zero. Next thing I know, its shooting low and to the right 6 inches. I know it shouldn't move that drastically with 2-3 clicks. I shot 100+ rounds and it would never stay consistent. I have tightened the scope mount to the rail. Groups are good with each adjustment, it's just always in a different area. HELP!!!!!!