once apon a time i had a Dumas Large Swamp Buggy - needless to say i had a few issues with it the main one being that it always seemed to pull one direction and would not track straight.[ the hull was warped] so it was torn apart and rebuilt and now the hull is straight but i still cant get it to track straight, it pulls to the right, i can give it full left rudder and it tracks better but still not straight ahead. my only thought is that it is in some way unbalanced, perhaps the muffler? but sitting in the water it looks like it's vertical and not listing. any help, ideas, questions or comments would be welcome.