Similar sail fabric and framing as the Wraith?
I didn't try exceedingly hard to be light with the 5.9 oz but did use light sail reinforcements, framing and components. Using one standoff per panel instead of two, dropping the nose nylon, spine Velcro, and skimping in some other areas might get the kite down to 5oz or a bit less. At that point I'd need different materials to approach your weights.
Again good job
My lightest outdoor kite is 98" wingspan with 2.32 ounces, it survived close to 2 years by now, and shows no sign of stopping.