I sailed a 5.2 along time,looking back I know for a fact that you do not need that much jib. Also, run the jib sheets to the front beam and lose those annoying cables thru the tramp and the antiquated barber hauler system if you have it.
I would seriously look for a a small F18 jib and try it for size, the standard F18 jib may work as well.
This will make your sailing much more pleasureable!