Sorry, but low carb does not mean no bolus doses! You might be taking fewer units, but low carb isn't no carbs and you would still need insulin to cover the carbs you are taking in. In addition, those who do low carb very often find they need to bolus for protein.
If you find your bolus doses aren't working for you you need to consider if you have correctly worked out how many grams of carbs you are taking in and, if you are confident your carb count was correct, then think about whether your current insulin to carb ratio might need adjusting. I would also look at the timing of your boluses - do you inject in advance of the meal or with it? Whether the other macros are having an impact - something really fatty will slow down the carb digestion and so your insulin might work before the carbs are active but you go high hours later (pizza effect). I would also look at whether my basal dose was working with some basal testing.