Academy came in during CoL research...early to middle if I remember correctly.
Need the 2nd cottage for 1-2 turns instead of working corn to get the last few beakers for 1840BC versus 1800BC Oracle->CS sling assuming pop6, but I did farm both fp later.
Keeping all the forests is not best, IMHO. Yes, it is shorter-term gain to chop, but you get faster Mids/GLib/NE/Uni/Oxford...etc. Those things add up.
However, I'm not sure if it offsets the hit to health and beats NP/forest preserves. I always go NP/forest preserves so I was trying something different to compare.
I'm not much for calculating into the future turns. I just play by experience and what seems best...which always leaves room for improvement, of course. Sometimes major improvement.
If I played this again, I would chop the green forests and farm those. And leave the plains forests. Try to get the preserves on the plains forests to fill in the green tiles after Bio/NP.
Not sure I can stand another noble run-through though. Maybe Emporer so I can compare my original game against it.