I believe that anything below 42 is considered to be "normal" so I would say that is probably the target, if one exists.
I suppose as low as possible would be the ideal but we all have to eat something and not everyone will cope or be as conscientious as the next person. I think the only advice I have ever been given, in terms of target, was to get below 7.0 on the old scale (whatever that is in mmol/ml) but I don't know if that was specifically aimed at me or just general guidance.
Sometimes we don't get very good advice when it comes to what we should be aiming for.
Thanks.