Wearing a baseball cap will help reduce the glare and improve your sight. Former top-ranked player Ivan Lendl was famous for wiping his forehead with the thick, white sweatbands on his wrists. You may not need the extra-wide sweatbands worn by Lendl, but sweatbands can stop the sweat from spilling onto your hands. The best way to wipe sweat off your face and hands is with the towel. Thinner string generates more power.
More elastic strings generate more power.
Softer strings, or strings with a softer coating, tend to vibrate less. Thinner strings tend to produce more spin. The more elastic the string, the more tension loss in the racquet after the string job. String tighter for more control, looser for more power. Your racquet should be restrung as many times in a year as you play in a week.