Hi Sue and Molly,
I'm glad
@Diana&Tom tagged me, I can totally relate to your Caninsulin journey with the odd numbers all over the place being unable to work out a pattern. Some days Josie's BG went right down in mid cycle like it's supposed to and somedays did not move at all. Some days got high red preshot readings some days low yellows and she responded pretty much the same to 0.5u and 1u.. Your SS looks awfully familiar and just like you I couldn't make sense of it all..

So you are definitely not alone!
We just changed from Caninsulin to ProZinc a week ago so still trying to get used to it and work out the dosage ( current 1u not doing much but with an increase hoping to see some better results soon..)
I'm curious to find out why your vet wouldn't want to prescribe ProZinc??
Our first vet was very ignorant and abrupt, just told us to dose Josie blindly with 3u as starting dose without testing at home

Thinking back I am mortified we actually followed his advice ..
Our new vet is great, she listens to my requests and works together with me. If you don't feel you are getting enough support and compassion from your current vet don't be afraid to change.
I'm also in the UK, also using Accu Chek and we also tried out Mac's which was really good choice but settled for Ropocat at the end.
As for feeding Molly you say she's not a big eater so maybe she would benefit from setting up an automatic pet feeder for overnight which you can also set empty to 'take the food away' 2 hours prior testing in the morning so you will know that the preshot numbers are definitely accurate with no overnight food influence.. We have one and it's been brilliant and a real life saver for us. Now I can actually sleep my 7 hours in one go without worry about her food intake.
How is Molly doing otherwise? Is she eating well, happy playful, alert?
You are doing a brilliant job so far, learned so much already and your spreadsheet looks great! Wish I could test Josie as often as you do!
A little suggestion you might find useful, maybe use the right side of your spreadsheet to make some side notes of anything important or out of the ordinary, any observations you might have. I use it as a little diary and find it useful to refer to when looking back to remind me things and when I'm trying to make sense of it all...
Don't you worry eventually you will get to the bottom of Molly's mystery and get those numbers down. You are at the best place to get brilliant support here from the Feline Diabetes Gurus