newlowc your target will be personalized for you and your situation. Similar to the way that some people find they do well with 50g carbs and other need to cut back to 25g of carbs. The simplest way might be to track where you're currently at and look to wind it back down until you're getting results you're after. In the comments Patricia notes that 50 to 70 keeps her BGs stable.

From the insuin load article "The appropriate insulin load will vary from person to person. A small woman aiming for weight loss using a lower protein ketogenic approach might have an insulin load as low as 40g per day while a larger man looking who is active and looking build muscle might have an insulin load as high as 300g per day."