You'd be fine with any moderate sized fixed head.
29" @ 50lb is plenty of energy.
My mother shot a big bodied sika stag with 34lbs, 27" draw. 3 blade grim reaper hades pro.
Full pass through at 26 yards. Elk is a bigger animal but he will have plenty of energy.
I would go with a 3 blade head for a better chance at a good blood trail.
Grim Reaper Micro hades would be a great option.