You might also consider a screw-in adapter and glue-on broadheads.
I'm guessing that "hate to sharpen them" is a three-blade complaint; is that right? There seems to be a lot of variety when it comes to two-blade glue-on broadheads. ACE, Magnus, and Zwickey offer quite a few running from 100 to 125 gr. Adapters run from 26 to 42 gr, depending on diameter and length.