In an article entitled the 'inch that changed tennis' it was shown rather satisfactorily that the modern topspin game requires a racquet far wider than the traditional wood one.
Beyond that it is a question of technique, although string pattern will change launch angle and strings will change slipperiness.
Originally Posted by BreakPoint
All players should have to generate their own spin using a 65 sq. in. racquet with an 18x20 pattern because that was the standard for over 100 years. Bjorn Borg could do it. If you can't do it then your technique is the problem.