Get the stiffy and go with a partial insertion of 1.75 inches (as per aldila to play to flex). Some people go to two inches. ( Now that sounds dirty).
Maybe one of the clubmakers can join in ... but I plan on having my T-Speeder pulled out of my 983 completely, only insert my stiff NV75 2 inches, wait for the epoxy to dry, then fill the bore through with some black conap epoxy, cover with tape let it dry, clean up with solvent and I am ready to go.