Sometimes it's just a matter of moving the scratching post to a more convenient location. Try moving the posts near your furniture for the time being and see how that works. If he takes to them, you can move them slowly back to a place where they are more suitable.
But, I cannot say enough about Soft Paws/Soft Claws (same company, same website, different name). They're soft vinyl nail caps that are glued over your cat's natural nails. They work AWESOME!!! I never had problem scratchers until my kitten, who came to live with us in August. Despite his 6-foot cat tree with natural wood, carpet, and sissal, he only wanted to scratch the couch. I put Soft Paws on him, and he didn't even notice. When he tried to scratch, the caps just glided over the couch. Now he doesn't even try to scratch anymore. I'm going to let this set grow off and see how he does. They run $17 or something, for four sets. You'll have to replace a nail here and there as the natural nail underneath sheds off. You can get them at pet stores, vet offices, or their website - www.softpaws.com
. And the vet who makes them is very nice, and she's easy to get a hold of, too, if you have questions.