Infection/inflammation, such as from a bad tooth, can cause some insulin resistance.

I would be more aggressive with the increases. The protocol says you can increase every 6-10 cycles if you are seeing blue. All he has seen is high blue so I wouldn't wait the full 10 cycles. You need to be more aggressive to fight glucose toxicity.
Judy and I discussed this in a condo a couple days ago and I also felt she could raise every six cycles even if she saw a little blue because she's experienced, he's been in and out of remission, and I was worried about insulin resistance.
She was a little concerned that she might not be giving him quite enough time so she decided to let him go a little longer on a dose where he is seeing blue. I told her I wouldn't go more than a total of ten cycles on the dose if he sees blue...and that's ten total cycles...not ten from when she sees blue. I had explained to her previously that the longer he sits at high numbers, the higher the dose will have to go to get to a breakthrough dose.
Judy....I think that Dr. Larry is thinking about the insulin resistance that comes with IAA and/or acro. For those conditions, we generally don't test until the dose gets to six units. Perhaps it's time to explain it in a different manner and tell him that what you are concerned about is
glucose toxicity:
Glucose toxicity refers to the oxidizing and hypertonic (dehydrating) properties of hyperglycemia, both of which continually stress and damage tissues in the body. But the term is also specifically used to refer to the phenomenon of temporary insulin resistance brought on by this tissue stress.
I copied this from Julie's post on
Glucose Toxicity. You might want to read through it again and share some of the info with him. You can see that insulin resistance can occur at a lower dose but I don't understand his comment about it occurring "at a dose we would normally expect to work". With Boomer, we would,normally expect 1.25u to work. However, it probably won't do to argue that point with him. I'd just try it from the Glucose Toxicity info.
I'd also press to get the surgeon scheduled if that is what you want to do. If the teeth are causing the resistance, which I totally agree with Wendy that it is a real possibility, then it's going to be a circuitous argument that won't get resolved if you don't insist (if that is the path you want to take) because the dose will likely have to keep going up and Dr. Larry might want the BG to normalize first.

Can we know 100% it's the teeth causing the issue? No but it sounds like there is definitely some dental work that needs to be done that "might" help. It could be that he did just build up some temporary insulin resistance from being at high numbers a bit too long. In that event, he will reach a breakthrough dose at some time but, as Wendy said, you'll have to be more aggressive to get to it.
Let hope the increase to 1.75u will work.