Good afternoon, and welcome!! Congrats on trusting your instincts and on putting together the tools you need to get Jynx regulated! Hometesting, smart dosing/shooting and a low carb wet diet are all key to regulation and eventually remission. I too have had problems with vets and their lack of understanding of diabetes and available protocols, but I've never had one discourage home testing.
A few suggestions...
1. Print off the sticky files here in the forum and put them in a binder where you can also keep Jynx's various lab results. There is a wealth of information there and I find it helpful to have it printed so that I can take notes and can easily find info that I need when I need it.
2. It sounds like you have HC food, but just in case you don't have a wide selection, put together a hypo tool kit with karo, foods of different carb percentages. You may have already done this!
3. I agree with Patty that Jynx earned a reduction with the 42. For newly diagnosed kitties (within 1yr of diagnosis), we decrease the dose with any number under 50.
4. I would suggest practicing measuring microdoses. Be sure you're using syringes with 1/2u markings (Walmart's house brand Relion ones are great and only $13/box.
ADW also has good options. There are two ways to measure the .25u. You can eyeball halfway between the 0.5u line and the zero line, or you can measure to the 1/2u line, then expel one drop at a time until you can't get anymore out. Then take that number and divide it by two, and that will be 0.25u. Practicing is good, as we like to provide pancreatic support for as long as possible before taking a cat off insulin altogether... it increases the chances that the pancreas will be fully healed and that the remission will hold long term. We will decrease doses by shaves, so if 0.25u is 3 drops for you, the next decrease would be to 2 drops, then to 1 drop.
5. Pick up some low carb treats for Jynx and give him one each time you do an ear poke. If he's already a mostly willing participant, he'll be enthusiastic in now time. Purebites freeze dried chicken breast is a popular choice, though I get mine in the dog food aisle... same product, but larger packaging and better cost per ounce.
As for your vet visit Monday, I'd suggest printing off the protocol here as well as the citations (or, if as a vet tech, you can actually print the article, even better!) and the Queensland dosing protocol. Be respectful of your vet's opinion, but be firm in your insistence that you have found an approach that is supported by published research in reputable publications, has an extremely strong forum for online support, and is what you believe is the best choice for your cat. Jynx's treatment is ultimately your responsibility and your decision. Don't let your vet, no matter how well-meaning, take that away from you. Reading and studying the stickies this weekend should give you everything you need to be the best possible advocate for Jynx's care.
Please continue to ask questions as you have them! Things are typically quiet on weekend afternoons, but I'm sure you'll get lots more input this evening. This forum and this approach has been a godsend for my cat Willie, who is 15, also suffers from pemphigus, and yet somehow is happier and healthier than he's been for a decade. I truly owe it all to the wonderful people here who have been so generous with their support.
I look forward to learning more about you and Jynx both!!
I'm still being advised by the vet to skip Jynx's dose tonight, and call tomorrow with #s before proceeding (after I called her this a.m. with my concerns of the high # today, and the SID dosing). I don't mean to sound like I think that my vets aren't good. They are wonderful. I just have a difference in opinion about how Jynx should be treated with this. Of course, I'm not a dr! Thanks, again, for the information, and wonderful site. I was thinking that he might do well on 0.25U BID, also. I'm still unsure what to do. 
