I've changed from the minion method to the snake method recently, and have found it much easier to get stable temps. In fact I can't think of any advantages of the minion method, except if for some reason you want higher temps and can't build a snake fat enough to get that much heat going. But for 230-250F the snake works for me.
You need to buy a packer brisket, not a rolled brisket. https://www.turnerandgeorge.co.uk/packer-cut-brisket.html
Been eyeing one of those up for a while Psymonkee, how much did it set you back and where from?
edit: I've been weighing it up against this, which is usually at £85 but is currently at £69! It's obviously not of quite the same quality, but I have seen a few good in depth reviews from guys who know what they're talking about and it seems pretty staggering value.
https://www.amazon.co.uk/dp/B01M4QB007/ref=sspa_dk_detail_0?psc=1