Keep your draw weight where it is. You could even back it off 10 pounds if you wanted to. Here in the 'States, minimum recommended draw weight for elk is 40 pounds.
More important than draw weight is that you are using sharp broadheads. I mean SCARY sharp. Do some research and find a good fixed blade broadhead. I'd stay away from mechanicals. But that's a topic for another thread...
Next would be practice. And then more practice. Probably ought to get some more practice while your at it. You can't kill what you can't hit.
Keep in mind that people were killing animals with bows long before arrow speed even approached 200fps. You'll be fine with your current set up.
Good luck and good hunting!!!