Have you designated the top/bottom limb yet? As you get closer to full draw use the strongest, least strained limb as the bottom. Full draw is where you see proper tiller but don't try to get there too fast.
Hickory sapwood and heartwood have slightly different characteristics with the heartwood being a bit more brittle but I don't think you need to worry about that. Just be sure that all of your corners are rounded so you reduce the chance of splinters lifting.