i shoot right handed. for whatever reason, my horizontal pin adjustment is FAR to the left. i am left eye dominant, but i block or close that eye when i shoot so that cant be it. on my new sights, when it's adjusted properly it (just like the old one ) extends WAY left, so much so that there is very little of the horizontalsupport bar left in the clamps that hold it in place.

here's the problem-after about ten shots, it vabrates loose, and i gotta sight it in all over again. any ideas how i can keep the bugger locked in place? also anyone have any idea why i have to adjust so far the the left?

Something is loose somewhere.You shouldn't have the pin off center very much at all.I know you don't want to hear this,but take it completely apart,and assemble it with lock tite BLUE.It will stop the parts from vibrating loose.If it still rattles loose then something is not clamping down properly,and you may need to replace that part.(Sight,Rest)