While using splits for bows is the way to go it is not the best way to go with a spear shaft.
Spears are made from green wood and treated. Bows are made with seasoned timber.
A self bow of yew has to be split so it contains both the heart wood and the sapwood.
For a spear, the nature of using a sapling for the shaft also reduces the likelihood of cracking and warping.
Fire hardening is actually a drying process that dehydrates the areas treated, usually the ends. The wood is not burned but the sap is cooked out. This is the last process before affixing the spearhead and possibly a butt spike.
With a bow, after it is shaped it would be boiled or steamed and shaped to hold curves for added power. Then it would be allowed to dry by seasoning so it loses its moisture slowly.
These methods make best use of the mechanical properties of the wood’s intended use.
It may not make that much difference but don’t be surprised if you get results you were not looking for.
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