That's strange that you don't even see it when viewing your storage adapters. Typically you can see it there but you can't add the storage until you do a persistent forced mount a la the KB I linked.
The only other thing I can think of off the top is my head is to make sure the LUN is set as maybe LUN 1 or 2 to start with. Sometimes using LUN 0 doesn't work well as it conflicts with the CDROM or local storage of the blade.
I have HS22's using the USB stick. I've never had an issue where the storage wasn't actually seen on the adapter, only issues where you can't add the storage with "Add Storage" because of the false snapshot issue.