Actually, my emphasis was on "a lot of cities" not the "high tech output." I typically turtle up in the early game, so even though my cities have the highest tech output in the game there are very often not enough to compete technologically with those who grabbed huge plots of land early on. The Kuriotates and the (AI controlled) Khazad also can't really compete with the shear number of researching cities, which is one of the main reasons I'd really like the tech costs normalized by civ size.
I still think that Era rebalancing would solve the OP's problem and make things more convenient for me too without having any adverse effect on those who like the slow early tech rate.
Also, I'd like it if civs could be given different starting techs based on Era, beyond just the ones everyone gets. For example, if the first era was composed of only the techs with no prerequisites, the Khazad would get to start with Mining and the Elohim with Mysticism instead of being on the same level as the Doviello who normally start with nothing. I think it could be better to have civ and era specific starting units too, instead of just having the ancient units plus a couple more.