I have wing droop with my Honey Boy!!

How do you fix wing droop when its velcro?! I know how to with snaps, but no matter how many times I stretch it across his hip, it sneaks back under... bahhh!!

I'm hesitant to put him in a bigger size (its a medium) because its a bit gappy already under his legs.....he obviously needs chubbier legs!!!!

(But on a very happy chunking up note - Miss M is now 7.5kg!! wooooHOOOOooOOOOO!)

WOAB: The said Honey Boy
WOMB: Something underneath a maz cover.. nope, it escapes me what the hell I put on her...