I suspect the tweak to g13 matchmaking is actually coming with the next update in the form of relics. You have to be g13 to have one, and it'll likely give a healthy gp boost. The problem right now is that a zeta bumps you by 2406, wo having 1 more zeta in your top 80 allows for a lot more g12 slots to be filled on your opponent since they're only worth a tad over 200gp. I know I've got a few zetas I'd rather not have now that were good at the time (eg. Gmy, Thrawn, vader leads).
That being said, despite that I haven't had terrible matches in Div1.