What do you want to do?
That bow is plenty heavy enough to take just about any type of game on this continent.
What would be your motivation for shooting a heavier bow?
If you want to shoot a heavier bow then go ahead. If you're worried about not being able to kill what you're aiming at with the bow you have, then I'd say your fears are probably unfounded. If you aim & hit where you're supposed to, the bow you have is just fine.
'Course if you don't buy & shoot more bows it's gonna be hard to feed the addiction...