Samlock
Addicted to ArboristSite
The birches I get to play with in this part of Norway are twisted, sorry-ass creatures, they seem to grow around everything else, and I can count on one hand how many nice, straight birches I've felled over the last year and a half.
(Saw looks great, Sam, one of the best looking Stihls. Easily.)
I've never visited in Nord-Trondelag, just passed by long time ago, but I imagine that's because you are on the seaside of the Atlantic ocean. Lots of wind and sometimes good snowfalls. Birch is very flexible as a seedling and bends severely under the high wind and snow. Too much bending breaks the cells inside the wood and it won't grow in a healthy way anymore. The same thing happens here on the hillsides because of the snow. Birches look ugly, but spruces and pines do just fine.