I think snakecrew's comment is a bit rude and completely offtopic.
Anyway, I like your videos, similar small slopes as we have here in southern Finland. Instead the term flock, we call that kind sloping as zagi-cloud or perhaps weasel-cloud... there is only small compression area in the slope and everyone is circling exactly there with foamies and collisions are unavoidable or even prefered, good fun actually
BTW you have some excellent slopes within couple hours drive or boat trip from St. Petersburg: Coastal cliffs in north east Estonia between Kunda and Sillamäe, the highest cliffs are about 60m high and wind directions from N to NE. And the island of Hogland, I've seen it only from sea but there seems to be plenty of slopes, the highest point being 173m above sealevel.