FATMAP difficulty grade
Don't consider this one unless you have good visibility and stability.
The ski down Chimney Col is convoluted with steep slopes that navigate crevasse holes, seracs, and ice "cliffs" (steep sections of bare ice).
We did this tour with a guide, as we were not comfortable with doing the Chimney descent on our own...
On the way back to Chickadee valley, descending from Boom Col, going skiers right avalanche path is probably a cleaner exit than trying to traverse to the skiers left avalanche path.
The guide we went with, who had done it twice before, said that the skiers right exit was substantially better than the bushwhack towards skiers left descent.