Hmm, Tutt says increasing the sweep angle should correct the slightly too far aft C of G, Huh? Surely, moving the outer wings back 4 Deg would add aft C of G
No - because centre of lift would retreat more than C of G.
Forget the aesthetics anyway. Adding wing-sweep is not beneficial to the niche that this aircraft is seemingly aimed at - if you want easy handling (for moderate ability pilots), ISR loiter time, possibly light CAS - why do you need wing sweep?