Thanks again to all of you!
@Turtle: the belly was tempered, but the bow gained to much weight, plus the tiller bounced twice. So, not much of the tempering is left. The recurves are done with dry heat, also I forced a bit of setback into the fades, which really gives the bow a nice profile!
Btw. the rings are small but the wood is really uniform, so I'm pleased with the way the bow turned out.