With the way the stays are run, it could only be the inner jib, or tacking would be a real adventure, especially in tighter quarters or strong winds.
on second thoughts this is your design and i shouldnt play with it. what i was going to do is play around with volume up front, moment and volume at the stern, change some hull characteristic, use 3 rigs, and alter the cabin position. but overall keep the same profile. anyways, good luck far