Using the category in the permalink can be a bad idea if you put any posts in more than one category. That creates multiple URLs leading to the same post, which creates a duplicate content problem with the search engines.
If you think that adding keywords to the URL will give you a boost in the search engines, you will probably be disappointed. Keywords in the URL only helps to form the keyword theme for a page. The effect upon ranking is minuscule. You are better off writing unique content and setting up inbound links to your posts.
I also recommend that you leave the permalink alone. The permalink is not causing whatever problem you think you are experiencing.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin