No, many people do well at 100+, though there are some that have to stay at around 20g carbs. From what I've seen on this bored many do well around 40-50g carbs a day for maitnanance or slow loss.

Cravings are very individual to the person. There are some common triggers that set a majority of people off, but not everyone. There are also some that only effect a few people. Part of Atkins is strictly limiting your foods, then adding them back in slowly so any intolerences can be easily traced. Many don't relize they have problems with wheat or certain foods until they have gone without them for a bit then try to add them back in. Many times when testing for food alergies they will have you do the same trial and error testing (non lethal allergies of course. They don't give someone allergic to peanuts some PB and say here try this )

If you are losing and happy, don't stress calories. Many find they actually eat too few and run into problems there. If you go into a true stall, and that is 4-6 weeks with no weight or inches lost, then calories is one of the areas you might examine.