That's an idea Phil - though you would want to incorporate the almost full span hardwood wingspar as well and you'd need to carve the washout in, which works very well, no sign of any tip stalling on my flights.
Next thing is to try the Mini Phase off the bungee and see if it does any better than my last attempt with a wee mystery glider, which went straight up, vertically, disengaged and came straight back down vertically hitting the ground four feet in front of me.