I can honestly say I've never experienced that one TFOX. They may be smaller in diameter but the bottom of the shaft still sits in the same spot on the rest as the bigger aluminums. Even with a shoot thru rest , if you have to close the prongs a little to accomodate the smaller diameter the elevation is still the same. When I switch back and forth between aluminums and carbons I've always had the carbons impact higher due to the gain in speed.