Unfortunately i lost the account in the second stage after the Gauntlet, however i spent a crazy amount of time to figure things out about the ITIN and other related documents.
I live in Belgium and we also have a tax treaty with the USA, however this tax treaty only applies if you have an ITIN and report taxes to the US government and your own government.
Also make sure that the tax treaty Sweden has with the USA does cover this kind of income. Most likely it will cover it but better be safe than sorry.
I still think E2T and Helios are one of the best funding companies out there, the only reason i didn't went back is because of the complicated situation regarding the ITIN.
You are in good hands at E2T/Helios, just make sure to get a good accountant who has experience in doing business with the USA, you don't wont to get in trouble with IRS.