I have a similar booster seat but it works well for me but I too have to slide it to the shortest position. Sophie usually falls asleep in it after a short while. I would try shortening the tether like mentioned above. 
__________________ Jackie Loves Sophie R.I.P ."Baby" our little girl 1993-2009
Last edited by MI Yorkielover; 12-20-2009 at 03:53 PM.
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