[Knotter]

It depends on the bow.

you can tune a bow to shoot a different spined arrow if you want. I tuned my longbow and recurves to shoot the same arrow.

here are variables you have to play with
point weight - less weight on the point increases the spine.
nock weight - more weight on the nock increases the spine
brace height - with a recurve this changes the noise profile of the bow quite a bit.
thickness of strike plate - thicker effectively reduces spine. reduces the
nock height _ - depends on radius of the shelf.

My vote is to drop the brace height on the recurve (within the parameters of the bows manufacturer.
decrease point wieght out of the recuve
If you have a strike plate- see if you can thin it out.

all trade offs.

do some reading on tuning and you will find you have lots of choices. play with one variable at a time starting with the easy/cheap ones.

re reading your post - arrows all over the place tells me you might have an easy fix by dropping the brace height on the recurve. for what you are trying to do it depends on the recurves center cut.