Restoring Hypo Awareness?

For a fairly long time I have had to drop pretty low (lower than 3.0mmol/L (54 mg/dl) before I have any feeling of a hypo developing. And the hypos I have even when my BG levels are very low are mild. I suspect when I was on MDI I had frequent enough low BGs (often 2 or more per day) that I lost the hypo awareness. Now that I am on the pump (since Oct. 2009)I have had a lot more control over the lows and now I may only have one per week and usually they are just borderline.

I am wondering if anyone has managed to restore their hypo awareness after loosing it? With the pump I have consciously been trying to keep my BG levels higher than I really want (6.0 to 7.0 (100-130)) and when I hit around 4.0 (72) or even 5.0 I correct that immediately to avoid falling close to a hypo level. I have managed to maintain this for about a month, but I have not yet detected a change in my reaction to low BG levels. Should I be keeping my average BG even higher?

This seems like a very challenging process and maybe I need to be more patient. Anyone had any succes with this or advice?
Pat