I run a Dax 70 on a Trek 7000 Mountain bike with the HD 9 hole mounts and have not had any wheel issues at all....I weigh about 160 lbs. I haven't abused the bike but I haven't babied it either. Perhaps, getting the wheel done right one time (trued... all spokes tightened as they should be...sprocket properly mounted)...and your problems may be over?
Andrew