RE: Need Plane for ST-40
Your biggest challenge will be the wieght issue. The Twists claims to be a bit heavier than SE. Twist 5-6 lb and SE 4.25 - 5.
You may look at some profiles. I only had one. It was a Sig Fazer. It was light and flew like a rocket. It weigh 4 lbs. Maybe someone else can jump in on some other profiles.
Something in the 4 lbs area would be the best. Perhaps a heckler or dazzler.
Also consider building a SPAD. I use my 40s with them. Good flyers and priced right.