Putting a new PM into the mix is a wasted effort, they don't have the history of the house and would have little interest in taking up the battle.
Get the monkey of a PM and the licensee who advised you in the first instance back on the case. By all means go to the tribunal and sit in on the hearing (the PM probably wouldn't recognise you in any case - listen to how poorly they have prepared - better yet meet up with the PM a week before the hearing to go through all of the evidence that they will be presenting, preparation is everything).
The tribunal don't care what amount you are leasing the house for (under/over market - it's irrelevant as they are paying what you have agreed).
Get the monkey of a PM and the licensee who advised you in the first instance back on the case. By all means go to the tribunal and sit in on the hearing (the PM probably wouldn't recognise you in any case - listen to how poorly they have prepared - better yet meet up with the PM a week before the hearing to go through all of the evidence that they will be presenting, preparation is everything).
The tribunal don't care what amount you are leasing the house for (under/over market - it's irrelevant as they are paying what you have agreed).