A pleasant side effect of those "jogs" in the barrel is that the weight distribution is favorably altered, in my opinion, and the weapon just seems to have an inherently more comfortable balance to it.
I also have a Colt MT6731 16" HBAR and while I like the gun, it just doesn't seem to fit me like a glove as does my M4gery. There does seem to be intangibles involved, too. Maybe it's just one of those things you have to try before you understand it.