Main rackets: Dunlop Revelation Pro Classic and Wilson HPS 6.0. Both 95sqin. All Courter 4.0-4.5, 1HBH, not a string breaker. No arms/elbow problems. Flat ground strokes but looking to add more Top spin. Prefer tension 52-55lbs. String properties required: 1. Feel and control 2. More power 3. Tension retention 4. Value for money. Havent tried many strings except for cheap Prince Syn Gut and Wilson Extreme which are ok but want some more power. Tried some standard Multifilament - prefer Wilson Extreme. Tried Alu Power - too stiff and no feel. Don't like. What I think I want is a solid core/single wrap like the Extreme but with more power. Thanks all.