"The tennis world has gone topspin crazy and players want equipment that maximizes spin..." I disagree with this first statement. A better statement would be "The racquet manufacturers have gone spin crazy and want their players to sell new propaganda spin-maximization equipment."
16x20. This is the sleeper string pattern that too few companies are exploiting right now. At its best, evenly spaced, it is the perfect middle ground between ‘free’ spin, ‘free’ power, arm comfort, and controllable launch angle. Can play at a high level with any string setup without breaking too fast. Tons of generalizations, but then that is more or less what the internet is for