I need rajang help!!!!!!

Get a purple-green-red horn and play:
pur pur red red pur pur red red green red green red
for atk +20%, def +30% movement up and attacks harder to deflect

that should give you an edge.

the notes will be more useful than the damage/element... since if you're gonna ignore the notes, why bother with a hunting horn? take flash bombs to keep him still when you need to buff yourself. go for whichever horn has green pur red and the highest raw, i'd use the red khezu horn

are you dying or running out of time or what? use the left/right/left/right swing, super pound is kinda crappy on a HH but its cool to get a hit in on his face. stick to the back legs is safest.