Not to add insult to injury, but this “formula” has been my go-to since Amy was introduced to the scene way back.
BMS, I see that as a “replaceable”. Get the best one today, if a better one comes around, get it, and keep the old one as a spare.
EDIT: Lately, an idea popped to mind. Just add new BMS balancing wires, that one can swap and change BMS at a drop of a hat. Or do what Andy did, and build an interesting easily BMS swappable connector. 
If it was me I would have tried for a refund, reset, and started again. Done it plenty of times on other equipment. The “damage is done”. You will “never” trust them batts again.
… the warranty for that one batt is “done and dusted”.