Robert, it depends on what style of bow you're shooting. Spine increases for the same draw weight in the following order: Selfbow, Hill-style glass-backed longbow, reflex/deflex glassed longbow, recurve bow. String type also influences spine. Skinny, low-stretch strings need more spine that Dacron.
A recurve with a skinny low-stretch string can need as much as 25# more spine than the draw weight number. The three bows you've listed could all need different arrows, depending on how they're set up.