Hello, been a while, good to hear for you.How is Fa acting/behaving these days?
Answering your questions.
1. No shoot under the reduction point, some people lower the reduction for their cat once they've been doing this a while. I think you were OK with those half doses those day as long as you could monitor. If you are still using a reduction point of 90, you missed a few reductions, so I'm glad to see you went down to 3.75 units today.
2. I shot scruff, or just below the shoulder blades on either side most of the time. But I did move it around in kind of a clockwise rotation so it wasn't the same spot all the time. Neko didn't like it elsewhere.The few times I tried it, I didn't notice a difference.
4. I haven't heard of the red paws before as an symptom of diabetes. Food allergies maybe?
5. At least a once a year checkup/blood work is a good idea with diabetics. Neko was more complicated so she went at least every 6 months. That way we caught her kidney issues early. I would go ahead with the dental. Irritations/inflammation in the mouth can make it harder to regulate the cat. A few things to mention for a cat that has acromegaly and dentals. First, they can have soft tissue growth in their throat, so the vet should check first and sometimes they need to do a kitten sized tube for the anaesthesia induction. Second, their can be soft tissue growths in the mouth which could mean teeth rub against gums. Neko once actually had a bony growth on her jaw too which her dental vet removed. Neko also had a slightly enlarged heart - it's a common acro thing but also Maine Coon thing, so I went to a dental specialist for the dental. They spend a bit more time/effort monitoring her vitals during the procedure, plus are used to dealing with older cats with issues. Good luck with the dental if you go ahead with it. Neko had a few of them and did just fine.