I use an electric constant pull machine. This also happens when I use a manual lockout. When I pull my crosses they do not stay straight. They curve downwards towards the throat of the racquet. To counter this I straighten each cross while it is tensioning before I clamp it. What is the effect of doing this? Each cross seems to be getting more tension because it is being tensioned longer while I straighten it before I clamp it. Is this bad for the frame? Should I wait to straighten the crosses until I am done stringing the racquet? Should I not bother at all?