I would not worry. I have flown god knows how many hours in an AA5B. It is a bit wierd with the pedals on the ground at first. It is because it is a castoring nose wheel. A mixture of power, breaking and pedal deflection is needed for accurate easy turning. It is just a nack you will eventualy get. You will find aircraft with a non castoring nose wheel much more responsive on the ground and will not use so much deflecyion, unless you want to do a tight turn on the ground.