And she is right. A certain string movement just cannot be avoided, no matter how high you set the tension. Also, the amount of movement highly depends on the type of string you are using. Imagine what happens during the stroke, especially if there is a slicing movement involed. The strings are moved sideways by the shuttle that is pushed into the stringbed. Once the shuttle has left the stringbed, there are two options: 1) the dislocated strings move back into their original position 2) they partially keep the dislocated position The more the strings are moved sideways during the impact (the more you slice the shuttle), and the rougher the used string is, the less likely it will be that they completely move back into a straigth position again afterwards. Raising the tension can reduce the overall movement, but has a lot more severe "side-effects". Better choose a tension that fits your playing style and ability and spend a couple of seconds to straighten the strings between rallies.
