Originally Posted by Yooper
An inch or so is fine. You don't get points taken away for it being less or more, though- it's just mentioned in the scoresheet.
Ideally yes, points should never be deducted for high or low fill. In practice however, that's not always the case. As there is no judging oversight, judges are essentially able to assign scores and give or take points as they see fit.
I've had several scoresheets over the last few years that mention "high fill" and deduct a point.