The compermise between alluminum and carbon is weight/speed. You should have plenty of umph to get thru a deer with your set up though. GT pro hunter shafts are tops IMO. I shoot advantage pro hunters and will for years to come.
I've tried other carbon arrows and had bad luck with them-lost deer with great shots.
Don't take ths the wrong way but if you didn't recover the animal, how can you confirm it was a great shot? With you set you have more then enough KE to pass through. I'd be willing to bet the great shot wasn't as great as you may think it was. Stick with the GT for this season and you won't be disappointed.