If that is 150gm of oatcakes - which would be around 80 gm of carb - that is twice what I eat in a day.
I am very sensitive to carbs, so keep to small amounts of carbs in order to maintain normal blood glucose levels.
Adding in any other carbs you might eat, from vegetables for instance, could mean that you are far from zero carbs.
I eat meat, fish and seafood, eggs, cheese and full fat dairy, and add stir-fry, low carb vegetables. mixed berries, a few nuts once in a while. I drink coffee with cream once or twice a day several times a week.
An ordinary type 2 would usually see that lowering intake of carbs would mean lower BG levels, certainly not as high as you are getting - so I am somewhat uneasy about your diagnosis. Have you been checked for other types of diabetes, and are you losing weight?