I don’t have a chassis recommendation, but something to consider and add to your dilemma. Chassis come with torsion tubes to stiffen them. The Intrepids have front and rear tubes. So you can stiffen a softer chassis with torsion bars but you can’t loosen a stiff chassis. Also seat stiffnes will affect chassis flex.
Hopefully some Intrepid drivers will post on this topic.
LAD Specialties customer / tony kart / rotax / kt100