Apparently doug fir was used for bows up the north west coast. Theres stories of the very top of the tree being used. They also mention using spruce and cypress, but if they were actually these woods or if they were mistaken for yew, who knows. some Inuit cable backed bows apparently used these lesser woods as well.
Incense cedar is not a true cedar, I believe its more closely related to cypress, but I'm not 100%
In my experiences with Fir it seems very brittle, but maybe a branch or tree top would be better. The branch you tied into a knot was probably pretty green