Is it possible to get really lean on just a really good diet with lots of protien and decent amounts of carbs as well say about 1.5 grams per pound of bodyweight?
Fat loss adheres to out bodies natural physiology. If you burn more calories than you take in you will loose weight/fat. Whereas if you are above maintenance calories you will gain muscle/fat. Total caloric intake is miles above on the hierarchy ladder of fat loss than restricting certain macros. Can adjusting macro levels speed up/enhance fat loss? In some individuals yes, but that doesn't mean if you function poorly/feel like crap on ultra low carb diets that you should keep them up for fat loss.
Find a range of carb that enables you to feel satisfied and keep up your gym intensity, and as long as you daily intake is within range for you too loose fat, you will.
Now on the other hand if you choose to go ultra low carb, it shouldnt be a shot in the dark. Fuel has to come from somewhere so it needs to be gotten from fat, carbs or protein turnover. In others word in absence of carbs- up the fat intake so protein wont be burned for fuel exclusively. In any event you need a baseline to track it so knowing your bmr would be a good start.
Low carb diet do have their advantages...
Like the body using fat almost exclusively for fuel....