Sorry to have nothing to contribute, but I'd like to bump up the plaintive wail for explanation, as I've always found LeafSpy confusing. The online LeafSpy manual claims that
The red bars represent those cell pairs that have the shunt active to bleed off some of the stored energy and balance the battery pack
, which seems to say that only the two very highest-voltage cells shown in the OP's histogram don't
have their shunts on; wtf ??? So the rest of the cells will be pulled even farther out of balance?? If someone is able to give it, I would really like to hear an explanation of this counterintuitive coloring of the cell voltage histogram bars.