You're about my size (I've been losing a bit of weight, but was heavier than you a few months ago. Same height.)

I'm finishing up a CLC Chesapeake LT18 (have already test paddled) and am very happy with it. The LT model has a lower deck than their standard (it's identical below waterline), but still enough room for my size-12's. (The standard 18 cockpit is HUGE - it felt roomier than the Necky Pinta.) There is an optional larger coaming (19" x 34" keyhole) that makes it very easy to get my copious frame into it - even doing a "cowboy" entry, yet still gives a good place for knee/thigh braces for help edging & rolling.

With the LT, the deck is pretty low (especially the aft deck). This means that with someone of our weight plus cargo, a lot of waves will break over the deck.

The boat tracks very well, turns surprisingly easily when edged. If you get your seat in the right spot, it doesn't weathercock much at all. Very fast & easy to paddle. Primary stability is good but not rock-solid. Secondary stability is amazing. Rolls reasonably well - about what you'd expect for a large touring boat.

If you plan on doing expedition paddling, consider the full Ches. 18 (not the LT). Higher decks and gobs of cargo room.

If you want a shorter boat, the Ches. 17 might be a good bet. (the LT17 with the lower deck might be a bit too "sporty" for someone of our size)

If you build a Chesapeake (especially the flatter-decked LT models) be sure to go with the optional extra fiberglass on the deck. The "standard" kit is designed for light weight, but hefty folk need a bit more strength. Doesn't add too much to cost or weight.

I haven't tried the Pygmy QC XL so I can't compare. The specs make me think it'll be a bit slower than the Ches 18, but most of us don't paddle as fast as the boat can go anyway. I have tried the Pygmy Arctic Tern. It's a nice boat, a little more maneuverable than the Chesapeake. A hair less primary stability, still good secondary. Comfortable enough cockpit, but not really enough foot room for me. I don't think I'd take the Tern on a multi-day camping trip, but if your feet fit it's a really nice play boat even for someone our size.

Just giving you more food for thought.

Val