What kind of stock are you shooting? Is is a Monte Carlo, or a straighter Handi stock?
Since you say;
I am finding my self shooting with the bottom corner of the buttpad on my collarbone.
I'm going to assume that the scope is too low. If this is the case, you need to raise the scope up, not down. You can do this one of two ways; one, you can use taller scope rings, or two, you can put an Ultra buttstock on the gun (This is the way I would go).
The Ultra has a raised Monte Carlo stock that is better suited for use with a scope.
Hope this helps.