i would be really interested to know, how many of your great persons are prophets/scientists/artist/...?
in every single game i play i get about 60% or more prophets, maybe 10% engineers and 5% each of scientist, artist merchant and statesman. i'd be really lucky to get more than one great doctor.
i'm not sure wheter that's a visa balance-issue - it might be rooted in civ itself, as i got vastly more prophets in vanilla/warlords as well - or it might even be down to my own personal playing-style? how does it work out for you?
PS: pacing: i realise that you only playtest & optimize up to noble - just wanted to let you know, that the pacing in the 2500-turn games really is off (not just a fluke in the earlier monarch game. currently playing deity with modern armors in 300 AD. not just me - the AI as well)