Hi Nomi,
I'm type 1 on a pump, and reduced my carbs by over half about 3 months ago. I did find I had to give insulin to cover protein, still not got it quite right but am getting there through trial & error.
I like numbers & ratios or formulae, I'm no good at just guesstimating insulin doses.
I read that the grams of protein in a protein food is 30-50% converted to glucose slowly, with a peak at about 3hrs after eating.
To deal with this, if I eat just an omelette with cheese & ham for breakfast, I use nutritional scales to tell me how much protein I'm eating (it's about 20g for 2 large eggs), divide by 2 & give the amount of insulin I'd use for 10g carbs, but not as a bolus straight away.
I did it as a "combo bolus" where my pump gives tiny amounts over whatever time you choose - I did over 2hrs - until you reach the total. I tested hourly & had no rise at all until 3hrs, when I rose by about 2mml/L, then went back to my starting BG by 4hrs. I've done this twice & got same results.
I think it'd work better to give the whole bolus at about 2hrs after eating, or maybe 1.5hrs, so that the peak insulin action was at the same time as the peak glucose release, and I intend to do this next time. Am just worried I'll forget as am not used to bolusing so long after food!
I've been nervous to give extra insulin to cover the protein when I'm actually eating carbs as part of the same meal, but have recently found that if I've eaten a lot of protein I do go high at 3-4hrs after the meal, so think I'll need to try a 2 stage bolus, part before & part after eating. No experience yet of whether this will work though.