Well I would say your edge is dead. You should easily be able shave arm hair. Also the spine should be on the strop at all times at no point should you remove your spine. Also I have no idea what dove black paste does but you should be stropping on plain clean leather. The strop should be held firm and your razor should not have any pressure on it. You will likely need to send your razor out for a honing. Once that is fixed you can return to shave and not scraping.