[dudefella]

If you're losing more than 2-3lb per week, it's probably not fat unless you're obese. Even on your workout days, try to do 30-40 minutes of medium-light cardio (heart rate @ 130-145bpm), and go a bit harder on your off days. Make sure you're lifting high reps (tho I'd hope you already know this). You haven't said how much you weigh, but the 2100-2300 calorie range is where you probably want to be.

Someone already said to do your cardio on an empty stomach... in my experience, it's not that important WHEN you do it, you just have to get it done. Personally, I can't do cardio without eating; I'm absolutely useless without some food in me. I prefer doing my cardio after a very light meal in the morning... if you get out there running relatively shortly after eating, your body isn't going to be getting any energy out of the food you've eaten (it hasn't been digested).

Make sure you're getting enough protein. Supplementing ~50g a day is a good idea. Cutting is pretty tough on your body (if you're going at it hard, anyways -- ie cardio 5/6/7 days a week, and hitting the weights 3-4 times/week), so an adequate amount of protein to allow your muscles to recover is really important.

Honestly man, 10lb in 6 weeks isn't that bad. If you're stuck for more than a week, lower your calorie intake (or change the source of your calories), and up the duration and/or intensity of your cardio/weight training. If you start dropping more than 3lb a week (assuming you aren't a lardass -- I'll give you the benefit of the doubt), ease off a bit. Just keep at it. You've got to work to change your body.. if it was that easy, everyone would be doing it.