I have shot an elkheart, but have never owned one.. I really like the grip on it! The grip and its mannerisms really remind me of a Thunderchild, but honestly think I prefer the standard grip on the elkheart over the standard TC.. The elkheart grip just pushes my thumb skyward a little more and I like that..
With that being said I think the elkheart is a completely different animal from the PL and the two require a completely different style grip to be shot well. IMO the elkheart/TC style bow is shot more like a recurve (higher wrist) where the PL, while still a hybrid, prefers a more palm deep D/R type grip.
I recently got a 62" PLX with a custom flat back Sturgiss style grip and slight locator.. I wanted to really try palming/open grip a bow and holy hell! right out of the gate I shot this thing better than any of the other beauties I have. The PL just requires the straight out palm push that is just working for me especially with this grip...