Sounds like you used way to much glue. I only put a very thin coat between each layer. More glue does not make a better joint. It can make a part soft and ruin it. I put a very thin coat of glue on one part and then slide the parts together making sure the glue is spread between the parts even, by that time they are almost completely bonded. Sounds like you were trying to glue all the pieces together at once and used to much glue to keep them moving while trying to adjust the pieces to fit your form. Try gluing two pieces together at a time against your form when they fit, glue another to those and build it up slow. I only use Evergreen and have had no problems doing it that way.