Hi Horey69,
Adjusting your lines onto the knots closest to the kite will not change the turning seed of the kite at all. It is mainly there to adjust out line length differences of an inch or two if you r bar isn't straight when the kite is straight overhead at 12.
It can make a marginal difference to power by shortening the lines but may make the kite more prone to stalling in lighter winds.
Experiment! Try the different settings, one knot at a time and make sure whatever you do to one side you mirror on the other. Dont make lots of radical changes all at once, make one change and test fly, then try something else once you have gauged the effects of the first change.
Hope this helps.
Good winds,