[Cory]

Sprocket size is not your problem. We are using 16T AM aluminum sprockets in our drive this year.

What brand/source of chain are you using? We do not use masterlinks anymore, but we rarely if ever saw failures due to them (if we did it was usually because of shoddy installation by us) and definitely never saw pins failing in shear. You could have bad chain, but far more likely you have improper tension/alignment.