Please don't double-post, and even more important - please do not post questions in the recipe database.
Recipe looks fine, although make sure you're doing a mini-mash with the smoked malt and and the carapils (and the brown malt, I believe); you need conversion. It's easy, there are lots of threads on how to do it without extra gear; if you can't find one, let us know and we'll walk you through it.
20 minute hop addition is probably pointless; you don't really want ANY hop flavor in a smoked porter, it should be all the balance between the smoke and the malt and the roast. Hops get in the way.