Al, 50lbs is more than adequate for almost any animal on the planet, especially at close range with a heavy arrow like you described.
As long as you keep your shots to within your KNOWN range limitation and have a good stout, razor sharp broadhead, I would not hesitate to use the recurve.
It is after all, shot placement that is the most critical factor in determining weather you bring your Elk home. So use the set-up that you have the most confidence in. 7lbs is not a great deal of difference.
"When I draw it there is no question where the arrow will hit."....
You have answered your own question.
-Sharps