I play my 10 in AV all the time and dont have any problems with it.

Don't use preform enabler. It will often get 1 of your guys to fill a spot in a game going all ready. Youll then have to start your queue all over again and re-wait.

Make two 5 man parties and on the leader of each queue as party. This will keep you from filling spaces and I have always got the same AV on both parties.