May I ask, how did you manage to close the crack initially, it was quite wide - I didn't understand that one? Ppl tend to humidify first, and then add a splint if necessary.
I thought Martins were made from premium materials. Hence their price. I've never had a Fender, Gibson, Yamaha or other guitar crack on me. And that wasn't damage. (Hence there being no impact trauma in the finish).