That sounds like a terrible dealer period. But customer service is not the completely on the bow manufacturer. I've dealt with good and bad dealers. Where I used to live the hoyt and mathews dealer wasnt so good but the bowtech dealer was so even though I shot a hoyt and still do all my work went to the good dealer down the street. I talked to the manufactuer (hoyt and mathews) about my experiences with the dealers and they didnt seem to care one bit.
As for form issues I havnt looked at the new mathews bows but the one thing that made me walk away from them was the soft backwall which it sounds like they fixed with the drawstops. The other gripe I had was the huge grip didnt work with my smallish hands. It sounds though that you are starting to get used to the bow I hope everything straightens itself out.