I didn't understand about the sidestays. However I've started trying moving the mast forward as you suggested. When I raced a 17 I had to have a lot less rake than the guys who were down to minimum weight. That was quicker downwind, and alas, slower upwind.

Appreciate the good luck. Thanks.

PS Most importantly my granddaughter loves the boat! The water splashes up through the centre of the trampoline.