Use lower poundage for the turkeys. Use lighter arrows to keep the speed up. Penetration shouldn't be an issue on turkeys. Crank up the poundage for deer while using a heavier arrow. I don't know what your max shooting poundage is but I'd get a bow that you'll set close to it's max for deer. Then take a couple turns off it for turkeys.
The 2 cam bows will give you more speed which you may want when the poundage is turned down for turkeys.
The 2 cam bows will give you more speed which you may want when the poundage is turned down for turkeys.