you’ll probably need a week top balancing such discrepancies at 2A…
Worse I’ve seen at the top end charging before balancing is 40-50mV. Idle typically 4-5mv and discharged goes to 40-50mV again.
Maybe it would be best to charge safely to a point and then if you have a bench power supply use that on a per cell level to top them up and bring them to a similar level at 3.5-3.55
but 150mV during normal charging means they need some serious balancing imho!