As pen dragon said it's not clear cut though. The problem is that on iso with creative you want to get a few strong cities that will likely be spaced further apart, so tile-sharing is harder.I see: short term, you'll likely have an easier time cottage sharing, and long term you'll likely have a stronger capital. If you don't have these advantages, I guess you'll need to expand creatively in order to retain the time advantage (3 turns maybe) of SIP.
you have traded with our worst enemy" because trading with a couple of foes. Then what? Are they going to plot on you from the other side of the globe? (while you are beelining chemistry) 
. I have 3 GS in waiting from running scientists in Hari and TGL and NE down in AT. I completed that wonder in 1 AD. I also whipped forges in cities with +3 unhappiness, a break-even no-brainer. I upgraded 1 Trireme to a Caravel and will upgrade the second one on the next turn. I'm looking forward to meeting the rest of the AI. I have a settler in place to plop down the iron fish city, which I might as well do this turn. Hari and NJ are building 2 more settlers for the western spots. Btw, forgot to up the slider: I'm making a meager 150 bpt at 100%.