If you like them but they are just too soft, rather than taking a $50 loss on the set why not just hard-step them by 1-2 clubs and install a 1/2" or 1" extension? Then you'd have the equivalent of about a 5.8-6.0 or 6.0-6.2 at the same playing length without much expense other than a few bucks for the extensions.
EDIT: OH WAIT...DUH!! Then you would be 1-2 shafts short on the short clubs! 😜 In that case you'd need to just tip trip an additional 1/2" to 1" from the tip (assuming there is enough PTS to work with), and ream the hosels to .370 which should be pretty easy since they're forged. If you don't have a reaming bit then that's about $30, but still less than taking a loss on the shafts and having to buy new ones.