I have just started making arrows from bamboo planting stakes.
I just found the tapered spruce arrow spine that shot well from my bow from some spine test shafts I have.
Made a very simple "spine tester" ( 2 nails to support the shaft, a 2# weight with a hook on it to hang from the shaft, made a mark on the wall to show how far the shaft bent when the weight was hung)
Took the straightened boo to the spine tester.
The ones that deflected the right amount were turned into arrows.
Those boo arrows shot well if cut about 1.5" longer than the spruce...with the same point weight.
The boo is heavier than the spruce so the boo arrow doesn't get going as quickly..which generally means needing a longer arrow or less spine.
all that said...it seems to me that boo needs a slightly lighter spine than spruce.
ymmv...especially since you're talking cane..but this is all the info I have to help..lol