I insist that it'd be more interesting if tiebreaks were played out from R2 onwards (ie 6-6 (1-0), 6-6 (1-1), etc...) Would make it more 'real' tennis-like.
I was actually thinking tiebreaks would be cool to play out as well, even at this stage.
It's an awkward ratio, sure, but matches like that call for it if they get that for. I think a tb would better reflect the competitive nature of the "match".
@Lenders, Sorry for the late reply.
My main issue with tiebreaks being played out is, as Featherer mentioned, that it would become longer than the set itself. As a result, there would be one(maybe two) matches going on, while all others of the pack would be done.
My initial idea, which I think would solve your issue, was to change the sets to non-tiebreak sets. So, in a Bo3 format, the first two would be tie break sets with the TB being treated as one game. And for the last set, no tiebreak. You require a difference of two games. Let it go to 70-68 if needed