I'm a T/C guy myself, so I would definitely recommend the Pro Hunter.
However, before spending the money on another muzzleloader, I think it would be best if you did everything in your power to diagnose and fix the issue. Some of the guys here (many of whom are far more knowledgeable than me) have offered excellent suggestions on things to try. But, if you're already dead set on another muzzleloader, well, as I said above. . .
Our T/C Pro Hunter shoots quite well with 3 Triple Seven pellets behind a 250 grain T/C Shockwave, which gives us a muzzle velocity of 2036 fps. Don't know whether you'd want to use that particular load on an elk or not; we've only ever used it for deer hunting. If it tells you anything, my sister used that combination to drop a big buck in his tracks at 221 yards.