To the tech rate comments, pretty confident tall is already in a great place for science. Maybe there are some example games to look at but it works all the way up to deity. The problem people seem to run into is those giant empires in the late game and there are some good arguments for mechanics that keep them in check. Do we really want to achieve that with this science modifier though? It strongly affects the early game too, where the problem doesn't even exist, along with a lot of other "collateral damage" to gameplay so-to-speak.