Planned Economy makes much more sense now.. I had to buy factories which drained from the money pool for labs. Also it just gets you that little bit of extra beakers earlier and therefore you reach plastics sooner.
One thing makes me wonder though - how do you accumulate so much culture to get ratio finisher in time? I had the same total amount of policies picked (including oracle ofc) and well, you know about my dark secret to get the ratio finisher now..
Another thing - once you pick up secularism, do you fill every specialist right away, cutting growth for max beakers? I am quite schizophrenic when doing this, microing citizens in and out of specialists slots... (I mean specialists that are not in sci buildings obv).
Btw, Peace Gardens is actually a quite decent belief, if you're a pathological river settler like me.
yeah, I think that 100% bonus is huge - I had to build a new city for coal, but even with that delay I could manage to get factories before plastics. for cap, it took 5 turns and for petra city, 3 turns for factory. 25% factory sci bonus alone is not really big (as you already have more than 100% modifier so adding 25% is not that critical), but with building bonus 100% and production bonus it gives and 2 engineer slots are great.
I think it's really important to get money for labs, as that's the time when real spt comes in. I think my spt was about 780 before plastics, and it jumped to 1150 with 5 labs bought after 2 turns.
for culture.. I think I had couple of culture CS allies couple of friends and that helped. As tommynt said, your cpt should mainly come from CS, not from your own buildings and artists. And I spread my religion to key CS first so that I could get 25% less decay bonus (with patro open, it's 50% less!).
I seldom fill any other specialist slots than sci before labs. For some cities with not that many good tiles I put engineer or artist too, but not for main cities. growth is really important.