I prefer to have more conquest points overall and a steeper ramp up. I'm fine with 51-49, but the next step should be before 58-42. I find comebacks often involve a rout of the enemy forces, giving the coming back force 70+% of the map. Complete domination at the end of C should be rewarded more. If the +2 bracket was moved to 55-45, and the later brackets also shifted down, with +10 at the exteme, and conquest points to reach moved to 3000 we'd get more reward for complete domination, with small gains still being rewarded.
Another idea I've seen floated that I quite like is different victory point incomes for different phases. Phase A could give no points at all, for example. That would make Phase A about recon and establishing a strong forward line. The victor of the game would be determined by performance in B and C. Phase A decks would still be strong as defending is easier than attacking, and they'd probably be getting points all through B.
Finally... there's always the "who holds most land at 40 minutes" condition. I honestly think that would be a very good victory condition. It makes sense and means that the benefit of strong early divisions is that you can be the defender later on in the game. It's quite a big change, but I think it would be interesting.
I like that last one a lot.