From what i see from comments of others: up to -2.5 front / upto -2 rear might not be ideal due not reaching side loads becoming large enough for even such mild camber increase to be best one, but as it's interim/reasonable little enough over stock, for majority to not bother enough to dial that back during winter due inconvenience of extra two re-alignments needed during season changes & little difference to be had from that "ideal", when camber is only at this level. I'm also another one not bothering, but asked just for interest sake, to widen knowledge about car / suspension.
P.S.
There is one exception to this though. That is - ice racing on
"saws", how here in jargon those skinny ice-racing studded tires with enormously big studs are called. Often seen, that if track has record laptimes for it, then winter records on ice with "saws" usually are better then best summer lap times with normal rubber on dry tarmac. So probably loads on tires/suspension can be high enough for camber to matter again, or it works different way with those 15x5.5 high sidewall tires with 2-3cm studs?