Not exactly sure how to answer your questions, so I'll just convey a little information:
1. Your desired 2.3 volumes may be within style, but that is in the lower part of the scale for "standard" on ales and similar beers. I've seen 2.2-2.6 volumes quoted.
2. Generally (at least in America) people are used to "fizzy yellow beer" which is overcarbed to style.
I guess what I am saying is that I think what you have is probably "right", but you are used to having "wrong" beer.
Also it will probably change a bit more in the next few weeks. Could be temp dependent as well. Dd you store at 70 for 3 weeks min and then store in the fridge at least a couple of days?