I was at about 10 when I started on my pump, and I'm now at 7.1, so it does make a big difference, but it can take time.
The best thing I've found which helps with pumping, but unfortunately isn't NHS funded is the Freestyle Libre.
It works out quite expensive if you do it all the time (about £100 a month) but if you can avoid getting addicted to using it, you can see every peak and trough in your bloods. Its a bit Like CGM but without hundreds of pounds up front. I used it for a month to get everything corrected, and now only use it when on holiday or ill.
Hopefully it will doon be available again, as they had to stop new orders as it was too popular.
Anybody would think I work them, the praise I give them,but I don't.
Even without a Libre it should get better, and I cetainly would never want to go back to MDI.