Timbo, I wait a little.
It's not a curing or moisture content thing, though, even as wet as the wood can be in spring. On strongly ring porous woods like elm and ash, I have had that growth ring under the bark, the one we want for the back, be so thin that it wouldn't hold over a thickish porous winter ring. I have cut several staves of elm, cut about when the snow melted off, that started to crack and actually have the eggshell-thin outer growth ring flake off. One I scraped down and saved at a lower weight, and a couple others that hinged where the flaking started.
So, have a look if you cut it. If that outer ring is under 1/16" maybe take off a layer, or just give it til the end of May, or whatever.