Well done for looking to really get to grips with your diabetes.
In addition to those you have identified, I'd suggest Diabetes 101, by Jenny Rhul:
https://www.amazon.co.uk/Blood-Sugar-101-about-Diabetes/dp/0964711613 That Amazon link (nothing to do with me!) has it as paperback (Used: very good condition) at £0.49, plus delivery.
As Mark suggests, sometimes reading throws up a lot more questions as you learn, but we've all been there, and most of us have found the forum to be great in those circumstances.