Originally Posted by Pete.Sampras.
I did adjust by using more topspin but I want to hit a hard flat shot sometimes. The PS85 allowed me to do that on a more constant level but with the K6.1 such shots can be a risk. Now I'm looking for a solution. Only if there is none, I will have to deal with the situation...
The "solution" is to take a shorten swing flat. You're already using a stiff control string. This isn't an equipment failure, it's player failure. All rackets can hit hard flat shots. ALL RACKETS can hit hard flat shots. Learn to control yourself when going flat.
Don't adjust by adding topspin. Wrong adjustment. Adjust by taking off 20% on your swing on flat shots.