One thing to remember is Imp's perspective of our actions. We've gone hard into SA almost every turn now and in his mind we want still want it pretty badly and he's going to make sure we don't get it. Do we know if he has an order priority card? if so he'll just slide to argentina to avoid our blob and we're in the same position.
I feel like we're in a dance situation where neither will take either bonus unless one of the parties get's lucky.
Also, Duke with one of your suggestions I can see him sliding his blob and then delaying enough to retake brazil to make sure we don't gain access to africa, I don't like moving our blob so far north. I think we should stay put in brazil (attacking with only small amounts to colombia and venezuela), blockade antartica, take greenland, and send a small group into africa. What this accomplishes is that we are making sure we withhold the bonuses from Imp while getting our +5(greenland) to be the overpowering factor.
One thing to think of as well is that Imp has got to know that we are blockading. Do you think he'd bank on that and use those troops to just scout antarctica and bring his troops back up. We can use some of our deployment to block that scout attack.
Here is my suggestion:
Continue withholding the South America and Antarctica bonus while taking Greenland and expanding to put pressure on Imp's homefront.
Deploy 6 to Kangerlussuaq, 4 to Siple, 2 to South Pole. Attack Colombia with 10 from Brazil. Attack Qaanaaq with 7 from Kangerlussuaq. Transfer to Kangerlussuaq with 2 from Danmark Havn. Transfer to Kangerlussuaq with 1 from Nuuk. Attack Nigeria with 4 from Brazil. Attack Venezuela with 4 from Brazil. Attack Only to Argentina with 3 from Brazil. Transfer 2 to Siple from South Pole. Blockade Siple.
I like this because it is making sure Imp doesn't get any progress from our fight, we have an opportunity to take South America if he doesn't deploy there (doubtful) but we still hold the advantage in South America either way. We get Greenland, and we also start making a move towards Africa to disrupt his EA bonus.