That's why I say we may confuse each other.
My fundamental assumption is that this shall be 2,000~3,500, not 800~1,200. You have Globalization, you have Scott in normal games which you can chop, you have Kilwa Ksiwani, also you have amenity bonus. Cities with all 3 buildings and powered provide 50+ base science, so this number is about 100% more. Late game cities provide 100+ science per turn each. And even on peaceful games you have no less than 15~20 cities.
However if you stay at the 800-1200 range it is sure that what we're saying may be very confusing to each other in all aspects. I always get 2000~3500 science per turn in late game. In this game the science peak is 2007 I guess. (I didn't build Scott as I cannot chop and it takes too long time to hard build, also there's only 1 Scientific CS on the map. So my SPT falls in the lower range.)
Not saying your 800-1200 being "incorrect" or so, just that I don't wanna be judged by misunderstandings and misleading statements. i.e. Judged from a 800-1200 point of view, everything in the 2000-3500 does may be hard to understand. For example, the 2000-3500 may take "How to surpass the 1-tech-per-turn limit" seriously in their games, and it may just be confusing about why doing so from a 800-1200 point of view. Other issues about Spaceport placement, how many builders needed..., etc. may also be totally hard to understand if one doesn't play at 2000-3500 himself.
About your unreasonable blames on great scientists, I really suggest you download the end save at #1 and have a look before making incorrect and misleading statements. Your comments make me laugh, seriously.