Hi emma
Don't feel guilty of your past results, after you can't change them, feel proud and good about yourself with the improvements that you've gained since starting the pump last september, as lowering your results by 3% is a very good achievements indeed so well done you..
6 months on a insulin pump isn't long at all, and you will find these figures improve even more has you get more used to the pump, and utilise the different features as you grow with experience and confidence using it..