RMR the most elusive number

When I first started working with my sports nutrition coach I was eating 3750 calories a day and I was losing 3-4 pounds a week. About 4 weeks ago my weight loss stopped. I'm not saying it slowed, i mean it stopped. Like it hit a brick wall. I've been stuck at around 310 pounds. We've tried all sorts of changes to get my weight loss going again. We've dropped my daily calories. We've dropped my calories on non-training days. Still nothing. Usually if I drop my calories a little, I loose a little weight. If I drop my calories a lot I drop a lot. But the last few weeks no matter what we do I've lost NOTHING! I'm sure he's as befuddled as I am. By no means am I frustrated. I'm OK with my weight on a personal level. My desire to lose weight is completely sports related. I'd like to get down to the 105k weight class and break those state records. And I'd to accomplish a body weight snatch. So, back to my lack of weight loss. I made an appointment at the University of New Mexico exercise physiology department to get my resting metabolic rate tested. After I find out what my resting metabolic rate is that will help me make the decision of what my calories should be.