Coalition Ranks

I have been looking for information on ranking up my coalitions, did not really find what i was looking for. so i'm asking here.
; ;

Does the coalition rank up faster if i choose to do the harder longer missions?

After reaching Rank 3 to get the -5k Bayld for Wildskeeper, is there a reason to keep going?

Can i just spam the same mission and will it count towards Ranking up?

At first when starting to do coalition's i noticed it would allow me to vote on what upgrade would be added "second floor ect" does it reset or is it permanent? server wide or just for me?

inb4 3hit the coalition ranking to cap

1) No, it's all based on imprinteurs.

2) Wildskeeper reductions are based on amount of imprinteurs used and there is a maximum of a 25k bayld reduction to wildskeeper KI, I'm not sure of how many imprinteurs you have to use for each reduction though.

3) Yes.

4) It seems to be permanent.