You want to try minimal pitch, try flying aboard most any low cost carrier outside of America (Spirit noted). I'm 6' 200 lbs and I logged three hours aboard a Monarch A321 that according to seatguru had a 28-29" pitch. It wasn't pleasant but I got through it. My fare of $79.00 vs. the $380.00 I would've otherwise paid definitely cushioned the skinny seats.

If you must fly in such reduced pitch, it's a good idea to get an aisle seat. They're less confining and it's good to get up and unfurl yourself once in a while, if only for a stretch.