Its already a tad roll touchy. I dont think adding weight on the tips will make this any better [X(]
Yes there is a C of G shift when the wings go back, and yes its noticeable, but noting unworkable. I still had enough elev to pull up vertical with ease and do that wing swing that Rav liked so much Gotta admit, it did look pretty sweet ( I almost wanted an F-14 for a moment there )
Regards Al