From what I have seen, most people on South Beach don't track carbs at all and don't need to if they are eating by the guidelines of the plan. That being said, there are lots of folks limiting in some way some kinds of carbs (grains is a big one), even if they are still not counting.
I do almost always count my calories and nutrients, because I already have a fitday account and it helps me with planning. I roughly aim for 40% carbs but it's sort of arbitrary, based on the Zone ratio of 40% carbs, 30% fat and 30% protein. IRONICALLY, I am not necessarily doing anything about obtaining those ratios, but when I eat what I consider a completely "on plan" day, I end up with close to that ratio.
My carb intake is much higher than yours, almost always over 100 g but usually under 125 g. I haven't really tried to lower them so maybe I would lose weight faster if I did
We had a thread
last week where I figured out that a "typical" Phase 1 day would be 62 g carbs.
Hope that helps at all. The bottom line is that South Beach doesn't count carbs and is not designed to be low-carb, but you can tweak it how you like by your food choices - as long as you are getting all of your veggies in - and end up on the *lower* carb side of things (as Natalia is doing).