Have you considered a Schweitzer 2-32 ? Roomy, high canopy, great load carrying capability. Can fit two people in the back seat if they're real close and less than 300 lbs total.

I'm 6'3" and 230 lbs and fit quite nicely in my Kestrel 19 (and the H.401 Kestrel has the same fuselage), and I wear a parachute.

Odd (to me) that you complain about the G103. I fit quite nicely in a Twin Astir T, Twin II and Twin II Acro, but with very thin cushions. No parachute; I'd be too heavy.

I don't like the fit of the K-21; I pull out the seat back and the sides press into my shoulders. I don't fit at all with my parachute on, but again, too heavy.