In regards to the kind of pot, I'd just stay away from aluminum.
I'm glad to hear you had an awesome experience! Especially with that dose of mimosa... Luckily the dose of vine was quite low, otherwise that may very well have been really overwhelming. 3-5g of mimosa is a more reasonable range with a full dose of vine. A lot of mimosa is 2% DMT content, so potentially a 12g brew could have over 240mg DMT, which is a ton. So much depends on the dose of vine though. When you find people needing 100+mg DMT, they usually just are taking non-psychedelic doses of caapi vine with it. Which is fine if that's what they want to do. But with a truly psychedelic dose of vine, even just 2g of mimosa is often plenty.
Your brewing method may have been one reason it wasn't too overwhelming as well. How long did you do each boil for? Then again sometimes the plants do seem to have some way of being gentle about it when people go consuming way more than is usually necessary.
Anyways, as you'll find throughout the forum generally for caapi vine the standard brewing is 3 boils, each 3 hours long. With mimosa, 3 boils each of 30minutes in length seems plenty.
Haapi trails
<Ringworm>hehehe, it's all fun and games till someone loses an "I"