I found bar height and width made a massive difference for me, have you tried playing with that before splashing out on some carbon?
I was running low rise carbon havens on my Cotic Soul but was getting sore hands after long descents, they were my first experience with wider bars. Swapped to some narrower, hi rise ec70's, made a world of difference! I have fairly narrow shoulders and when riding the forks it felt like the force wasnt being directed up my arms. I've put them on my Enduro with its much shorter reach and coils has a completely different riding style/position and they feel fine...
Tbh i dont see that carbon bars would make that huge a difference on a plush trail/enduro bike, for rigids or hardtails if you like to run your forks stiff then a good quality carbon bar will be noticeably more compliant though.