Ok, here is what I think after looking at the save in more detail:
*The most important exploration unit right now is a scout, not a galley. We should make one and send him inland.
*One city whips axes into colossus, another city whips axes into moai. At about 40 overflow hammers per whip, with a 2x for the resource, this should be 3 whips (240 hammers) and 5 turns of organic build (5*11*2 = 110 hammers) in Corsica. This is actually a bit too much and we won't use all of the third whip into the colossus, but the overflow can just go onto the next axe. Corsica is a must for one of these spots, and can produce the wonder within 10 turns of now.
*Elba is the natural second place because it is not as whipped out as Lyons right now, and can handle the 1 extra pop thanks to being the capital right now. It will also likely become a GP farm, and thus could use wonders. It will take like 2 turns longer because of less overflow and weaker organic building. But Elba is the natural GP farm in this game, and Moai isn't useful there, so I think Corsica should build Moai and Elba should get Colossus, despite the slower Colossus.
That's 6 axes. We need 12 (and 2 spearmen). We only need 12 because Ragnar is going to declare on someone, and it's very likely not us. (However, it might be worthwhile to park a galley by Nidaros to make sure of this.) It's usually a good idea to keep cities at about same level of slavery unhappiness, so this means one more whip in Lyons (a 2 pop galley whip; galley in Lyons because it is furthest from Ragnar), three axe whips in Orleans, a lighthouse whip at upper end of pop 3 in Paris, then a granary whip in Paris, then two axe whips in Paris, and a 2-pop granary whip followed by two axe whips in Rheims.
Replace two of the above axes with spears. This is 11 rather than 12 axes, but whatever, we'll deal. Somewhere in there there will be an organic axe produced?

. Nah, probably not. Overflow into a scout somewhere early-ish.
The invasion plan I think should be a first group of axes marching along the northern peninisula, and a second group of axes delivered by three galleys directly to near Nidaros. Sucks to have to take Nidaros first without experience from the first combat, but the inefficiency of attacking Uppsala is too much...
Why is it ok to whip so much? Well, because our higher population is useless, and we're about to hook up gold. This brings me to my next point.
I think iron is less important than an extra luxury resource (we're getting iron from Nidaros anyway). Thus, I think the next two settlers should go on fur and dyes. Also, hook up spices as a priority (chop forest, then road, then plantation -- we should have calendar by then.)