the sets ending at 11 points - well, we won't be able to change this any more
But the regulation with "only backhand services" would - in my opinion - be the best one which can really be controlled... all the regulations concerning not-hiding the ball have one problem: the referee has to count wrong services as faults, but imagine when someone of your team is counting in your match - do you really think that your teammate will decide any service wrong? That's the greatest problem of the service-regulations... so the regulation with only backhand-services would be the only one that can easily be controlled without any discussion in the lower leagues...
...so long