I think that the system in place now is one of the fairest and most enjoyable that have been implemented to date. I think that the customised canonisation of each family that Marty is setting up (and which has been in place for a number of months now, really) is a brilliant idea: it provides fluidity and flexibility in terms of story-telling, and gives each family uniqueness and identifiable bargaining chips that are sought after by other nobles, as each family thus has something that other nobles families want. Yet, each family has their weaknesses too, which drives them to interact and seek out other houses for help.
There are no hard numbers. The system is more difficult to "game" now and there are allowances and provisions made for smaller or independent families to be able to stand up to "cliques", as Marty has already said.
Yes, there are cliques. We all know it, and in the past, the existence of cliques has caused some issues that has led to stagnation in gameplay and bad feelings in general.
In the past, there have been systems that I personally call the "playing the spreadsheet, having house guards + tavern tea parties = titles, but boring and stagnant noble rp" system, that didn't work very well in my opinion. You did have cliques of families (I felt) that would monopolise the State Council and Synod, voting themselves in and giving each other positions and Synod favour, which resulted in a cyclical phenomena where these families would have more and more titles and stronger armies. Meanwhile, everyone else would be locked out of the positions and government, and be receiving Writs of Sin, etc. Thus, you had families who could never really make any headway.
Were the "cliques" doing anything wrong? No, not really, they were only playing the system that was in place at the time. But yes, it was a bit of a miserable experience for others.
But. This old system is gone. Good riddance. Don't come back. The new system is working, I think, and as long as the smaller houses or newer houses or independent houses don't lose their heads and stand up for themselves and be patient, they should be ok.