I've never heard of a wing exploding either, other than fludder I can't think of anything that would cause a wing to do that.
As for your stab failure, when you removed the covering in the center to glue it in the fuse did you use a knife to cut the covering? If you did, it's likely that you cut to deep into the wood making it weak thus causing it to fail in flight.
I don’t see any reason to add the carbon fiber to the horizontal stab but that's up to you. I would suggest you just order a new set of tail feathers from Tower and get your plane back in the air.

http://www2.towerhobbies.com/cgi-bin...?&I=LXECJ3&P=Z