Corbon PowRBall ammo is a 100gr+P. Corbon also has a 90gr +P JHP round....... and Corbon DPX is a 95gr +P load, which is advertised at 1300FPS from a pistol (don't know the barrel length). I'd go with the DPX if anything because the Bares bullets are proven, even being as light as they are.
However, a pistol carbine still shoots pistol rounds. It's not a "rifle", even with the few hundred FPS you gain. I'd stick with tried a true selections, like HST, Gold Dots, or the heavier offering of DPX in 115gr. +P.
The only major benefits of a pistol carbine that I can see is it will take the same ammo and in some cases, the same mags as your handgun, making carrying spare ammo and magazines very simple. However, it seems as if this firearm is mostly a hobby gun. If you want a true defensive long gun, buy a true rifle. Even something like a very affordable SKS shooting an intermediate rifle round is going to trump any pistol carbine as far as stopping power goes.