Hi Norried,
I believe the official figure for low-carb is below 50g carbs per day. This is because 50g is what the average person needs in order for carbohydrate to meet all their energy needs. Below 50g the body has to meet its energy needs by burning fat, which is why you tend to lose weight very effectively on a low-carb diet.
If you are really struggling to reduce BS levels on 75g per day then you should certainly consider a reduction to 50g, or even lower. You will probably find that at least part of your problem is insulin resistance, and running your body at a low carb level for a while can help to overcome this. Once the BS levels are down to somewhere near normal (i.e. readings regularly in the 5s or low 6s) then you can start to up the carb level a bit.