To get a pass-thru on the "knuckle" you need a gun.My set up is fine. I got one of those new Matthews and I shoot 30.5" and 70#. What I'm thinking about is decreasing my penetration potential by adding a bleeder or shooting a wide blade broadhead.
To get a pass through on the shoulder knuckle, I believe I'd need an african dangerous game type set-up... 1000+ grains with a grizzly Stik ashby head. I'm not doing that. So, I'm considering increasing the tissue damage potential i.e. bleeder and or wide head.
As far as shooting a bigger broadhead, I am all for shooting big expandable with a setup like yours.