I reheated the leftovers for calmari tacos tonight--so killer. For future cooking, I recommend to folks to lightly make cross cuts both directions and on both sides all over the meat to maybe help the curling issue. Kinda like scoring the bottom of a shrimp to make it butterfly flat.

Also, it's key to pull off or scrub off any membrane you find (in addition to the skin) as some of it cooks up into a rubberband like piece that is unappealing when eating. I found several small stretchy pieces while trying to bite off a piece--just pulled it off.