Mathews has its own forum at
www.mathewsinc.com. The nice thing about that is since it's ran by Mathews, it has several corporate reps who frequent the forum and are available to help out with tech issues or anything like that.
Bowtech has several corporate representatives who frequent this site, myself included obviously. Not sure if Hoyt's got its own forum; perhaps TFOX or someone could help out there.
Welcome to Huntingnet by the way; this is the friendliest and most-helpful bunch I've found over the years who're willing to help other bowhunters out -- irrespective of their bow of choice.