If I'm reading your posts correctly, you are saying you eat 25% of carbs, 35% of fat, and 40% protein correct? I've found very little (even on body building websites) on getting carbs that low and proteins that high to achieve weight loss. I am a little ignorant on CFP ratios though. The one site with a lot of info mentioning the 25/35/40 emphasized burning more than you take in, not creating a deficit, so I think that was not really geared for what you are trying to do.
But you say you don't want to gain muscle. Having protein that high is likely affecting that. Not sure what work outs you are doing, but if you are doing mostly strength training, it's also definitely going to cause you to gain muscle with your current diet. Also, with the amount of fat you are getting, is it good fat--unsaturated fats like the kind found in avocados, fatty cold-water fish (salmon, trout, tuna, etc), olive oil, walnuts, almonds, etc? Or is it saturated fat?
Are you getting enough fiber with your carbs that low? How much sodium as you eating (under 1500 is the latest recommendation)? Are you drinking enough water?
If you are truly set on a personal trainer, there's no reason to out yourself to them. Yes, T is a muscle builder. But like tvc said, you aren't abusing it as a steroid. Your levels should be the same as most other men your age--they don't need to tell a trainer they have testosterone in their bodies!