Some of your post meal readings, could be down to the Protein and fats you'll eating..
A low carb diet, replaces the missing carbs with Protein and Fats.
About 50% of Protein breaks down into glucose and impacts on the blood glucose, in a more traditional diet the amount of protein you eat the impact on the blood glucose is negligible, due to it's a slow process and the body tends to burn it off before it really impacts... How ever with the low carb diet, the increased amount can have quite a noticeable effect on blood glucose.. Even if you like I do eat a more traditional diet, with meals such as an omelette which are high protein I have to allow some insulin to cover..
Also within the low carb diet, the increases amount of fat being consumed can increase insulin resistance, so again requiring a higher amount of insulin,
As to the suggestion of using a pre-mixed insulin and 2 injections a day...
It's a possible way around your problems, but for it to be effective means you'll will have to follow a very strict regime, as you will at times need to feed the insulin to avoid a hypo, so it's would be a case of have 3 main meals (breakfast, dinner and tea) and 3 snack (mid morning, mid afternoon and supper) but also each of these meals and snacks need to have a set amount of carbs to them, and be timed.... So if you are having breakfast a 6.30am on work days, you be having breakfast at 6.30am on your days off and hols as well...
This is the method I started with, it was at the time the only regime for the diabetic, the only difference is that I used to draw up, a then quick acting and long acting insulin into one syringe to inject, it didn't come pre-mixed... Lot better as you could adjust either the long or quick to suit better...
If you really don't like injections, perhaps asking about having an insulin pump, yes you still have to insert an cannula, but depending on what type of cannula you using, you only have to change it every 2 or 3 days... And you do get a 'gadget' that will insert the cannula for you... A press of a button and it's in...
I hated the thought of injection before I became diabetic, but did get used to injecting, strangely even though I can inject insulin into my self, I've never really gotten over the 'needle fear' as yes I fine with injecting myself, but likely to flake out if somebody else tried to inject me! As a rather bemused nurse found out, when they thought I was fibbing when I said I don't like injections.. Has he approached me with a tetanus jab, saying 'she who injects every day' as I went white as a sheet and started to slip down the chair