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If engine was a perfect air pump then supercharger would develop same amount of boost troughout the rev-range. But VE actually changes trough the rev range depending on cams. Thus engine will accept different amount of air as VE changes.
If boost only varies between 10-11 lbs then it sounds like supercharger does its job but needs to be geared a bit higher (if more boost is needed). Of course, if supercharger is reaching it's maximum permissible speed at maximum revs with current pulley then smaller pulley isn't going to solve the problem and bigger supercharger is needed.
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Thank you for your time,
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