Hey academicdiabetic!
LADA's a b****r for that! I've had it for nearly 4 years now and I have reached some type of consistency with it but I still get too high highs and too low lows sometimes. In the early stages it was mad because I never knew what my pancreas was going to produce on any given day :roll:
A couple of observations for you that have helped me:
The 1:10 bolus:carb is only a starting point - you will need to adjust that for different meals, especially if you low-carb - the carb ratio doesn't really work for low-carbers. When I eat a no or very low carb meal, I still have to have 1 or 1.5 units Apidra (equivalent of novorapid), so basically, bacon and eggs would still require 1.5 units Apidra. In the absence of carb, about a third of the protein you eat will break down into glucose and will need to be jabbed for. High fat meals can delay the spike and I deal with that by splitting the bolus dose and taking a unit or 2 with the meal and another unit a couple of hours later.
Another starting point - 1 unit bolus will drop your BG by 3mmol. You need to spend some time experimenting and recording and working out how much 1 unit Novo actually drops you by.
For me, 2.5g carb will increase my BG by 1 mmol and 1 unit Apidra will drop my BG by 4.5 mmol. From that knowledge I have managed to bring a bit of consistency to things. (For your info, I am 7 stone and eat about 50g carb a day. I eat no bread, rice, pasta and very little potato and cereal. If I introduce those things into my diet I get the high highs and crashing BGs you are experiencing.)
I calculate every bit of carb I eat and jab for it. That includes vegetables, salad, pulses - the DSNs tend to tell you not to include those things. They are wrong! They also tend to tell you not to jab for anything of 10g carb or less - 10g carb would raise my BG by 4 mmol - I need to jab for it!
Now, your Levemir. I use Levemir as my basal. I take 6 units in the morning and 4.5 units in the evening. I find splitting the dose helps to give me coverage throughout the day and night without causing hypos. Levemir seems to last only for about 14 - 16 hours for me but to taking a bigger dose in one go to make it last longer causes me to hypo. So if you're going to try increasing your Levemir, you might be better reducing the single dose and adding a second dose rather than increasing the single dose.
Anyway, I hope some of that gives you some clues as to what is going on with you. I really do sympathise!
Take care
Smidge