There are some some extermely talented folks working to make the brahman better(in terms of carcass quality). JS jenetics comes to mind, and LSU is everpresent with these types of experiments. BUT, since there is a backlash against ears, some of us down south may want to consider a different approach. Perhaps Tuli to cross? I'm not sure of the answer, but with the science today, anything is possible.
From my own experience, I've find that as little as 25% brahman in a cow/calf is enough to give them the stamina to withstand the heat and humidity. Most Brangus and other Brahman cross (braford, charbray, etc.) have 3/8's brahman. This is a little too much for my taste, so I wind up crossing them with either a angus bull or an angus plus bull, to get less brahman characteristics. Just my thoughts, because i despise getting docked because a calf has big ears.
My two cents