I wouldn't think it's the club to be honest ... a mid flex shaft will suit most golfers.

The problem with a slice is it has many causes and effects, it's not just a single factor ... I suggest you visit a teaching pro and get him to look at your swing and ball flight.

Without some detail of your ball flight or divot pattern, it really is difficult to give you advice on what the problem could be. Can you post a video of your swing?