Here's a simple mantra that has helped me lose 38 pounds; "Eat less, move more", a quote from Marion Nestle. It's easier to accomplish this goal and incorporate it into a healthy lifestyle. Diet fads come and go. Moderation is the key to everything.
I had this problem the first couple times I used my egg. I read somewhere on this forum to start a small fire at the top center of coals, and then close the lid with daisy wheel holes open and bottom vent cracked a half inch (I have an XL). Let the fire spread slowly to desired temperature. This should take about 25-30 minutes. This method works great for me. I've found that it doesn't matter how much lump I put in the egg, it's the amount of lump that you let catch on fire that matters. Start a small fire, close the egg and use the amount of air you let in determine the temp. It sounds like you've been starting a large fire, and using the amount of air you can keep out to set the temp. Once you get a bunch of lump on fire it's hard to cool it down. Also, I would highly recommend using an electric coil starter. That way it's easier to control how much lump is being lit.