^^Yea I think it's really safer whipping tbh. I just had Mansa whip GLH in 1150BC in the test game -_-
4. Waiting on Pyramids doesn't change much on Library timing, the difference however is on the turn of completion we get move overflow because of Stone, so I'd actually start Pyramids right away once Masonry is done. (in 2 turns)
I found that starting mids after stone connected won't delay the mids completion if we want 1375 BC date in need of 5 forests, while it make difference if we accept the 1325 BC with 4 forests.