What type of insulin regime are you using. Are you doing long acting only or are you doing MDI(Mulitiple Daily Injections).
If your doing MDI with short acting at meals how are you determining your injections. I have been practing carb counting which is helping even out my highs and lows. I don't always get it right but nobody does.
Is the reason you stay above 10 because you feel low if you dip below that? If thats the case you can try lowering you targets over a long period. If your body is used to running above 10 then you will feel low if you dip much below that even though the number is still high. By lowering your targets slowly your threshold for lows will go down to where you feel low only when you are truly low.
Gary