Good job! Great improvement for just three months! I had a dramatic drop in A1c when I started the pump, but it wasn't that good!
Sucks about the insurance though, sounds like a common issue (I spent a few hours on the phone with my insurance co. myself this morning). When you say they won't pay for "all of your pump supplies", do you mean they only pay for some supplies and not others, or not in the quantities you need, or won't cover it 100%? I'd advise you how to go about handling it, but I'm not sure what the situation is.
As far as adhesive goes, I'd used the good ol' waterproof first-aid tape from the pharmacy for awhile, but now I've moved on to the IV3000 and find I like it a lot better (though I did grow some yellow crusty stuff under it once after about 6 days... yuck!). I really believe that the better adhesives - the ones that cover the whole thing, help keep the CGM wire from moving around and help it last longer. That's been my experience, anyway, so you might find it worth it to buy IV3000 or Opsite Flexifix.
But spend the next few days celebrating (not with cake!) your dramatic improvement in numbers.... the insurance battles will still be there when you're ready to tackle them. :)