Drive continuously for an hour at freeway speeds, navigating to a mostly empty V3 supercharger (preconditioning and whining is mandatory) the whole time, at this time of year, and arrive at 10%. Report back what you see, grab some data (pictures showing SOC and charge rate during the charging event). Then hopefully we can identify if there is something wrong with your car.
Remember that for road trips (not in winter), which is the only time when Supercharging speed matters (Supercharging at other times is completely optional and not necessary for most owners), the conditions will usually be met for optimal charging (as long as you don’t attempt to charge first thing in the morning). It’s usually just a matter of finding a charge station which is in good shape, and with no sharing for V2 (can be challenging especially for V2).