Gator,
Back up to about 20 yards first and then tell us how they do. I'm betting they'll head on off to the right, indicating weak.
I wouldn't cut off anymore (though, that's mainly because I like a long arrow) - instead, build out your sideplate a tad bit...such as placing a piece of toothpick or wooden matchstick underneath whatever's on your sideplate (Velcro, leather, sealskin, etc.).
Don't give up on the carbons yet - they're a pain in the a$$ sometimes to tune right, but once you get 'em they're some hard-hittin' sumbit......