I never retorqued mine, and have not had a problem at about 7000miles boosted 22lbs. I believe it was moly lube we used on mine. not sure if that's what it was, but supposedly requires no retorquing if you use it.
Have you taken the head off to see if they loosed or if maybe your head gasket actually blew?
Always let the engine warm up to temp before boosting?