I don't but the k3 smalls run larger than say SG for example. And the belt can be moved out on the frame to make it more adjustable. Don't know if that helps you at all.
Yes, this is a K3 spider frame. The K3's originally shipped with an aluminum frame, but Exo had reports of stress cracks or full on breaks with the aluminum, so they shipped out titanium replacements to everyone.
Someone has to want a like new Exo K3. Hit me up. Id be open to partial or full trades for AR optics, maybe size 30 pants (kuiu, first lite, etc) or a nice puffy in medium. Let me know what you've got.