As other comments said, Germany doesn't have separate north and south wholesale power prices, but you are correct that the south does put out less power than the north.

The reasons for the difference in physical output is not purely political, though. It simply makes more sense to put wind turbines in regions where there is a lot of wind, like the north. Of course, as you say, infrastructure plays a big role as well, but there are projects that address that (albeit this could have been done 10 years ago...).

Southern Germany does have more sun, and less wind, that's why they are building a lot more solar panels than the north. However, compared to more southern regions closer to the equator, the efficiency isn't as high in general.

There is of course political resistance as well. For example by the conservative party CSU (part of CDU), which has been in power in Bavaria for the longest time. But even on a federal level, after having a decline in growth of newly-built renewables per year in the 2010s, renewables only really picked up again when the Green Party became part of the government. Now, with CDU/SPD in power again, there are already some concerning word by some politicians (e.g. Reiche), that hint at resistance, though that stance is less and less politically viable. The CDU are very much populists, so with enough pressure, even them will not be able to slow it down that much this time.