I am MTF but I have quite a lot of experience in the body shaping department. The fact that you are already on testosterone is going to be a big plus here, this is actually why I am working to get my girlish figure prior to estrogen, on testosterone you can add muscle and burn fat(for FTM) or burn muscle and add fat (for MTF) at a rate much faster then E.
It just depends on your diet and type of exercise that determines which direction your body will go on T. I do not agree with the previous poster, that much cardio is only going to enhance your already girlish figure, yes it will burn lots of fat but it will also burn muscle and you will quickly find your shape looking like a fit female.
I personally am stripping off my 245lbs muscular body to form a fit girlish figure have cut my calorie intake down to about 1250 a day with little to no proteins, basically eating veggies, fruits, grains.... for energy I take Liquid B12, B1, L-Tyrosine, Powder C, Herba Mate Tea, Iron, Liquid D3, Powdered Magnesium, Potassium... I also use a carb blocker "White Kidney Bean"... Wearing a Ann Cherry female waste cincher for 10 hours a day and do an elliptical for 1 hour every day, no days off and working out on and empty stomach each morning plus not eating for 3 hours after. I have dropped 1 to 2 pounds per day using this method and when weight loss stalls I eat normal for a day and it tricks the body into more weight loss.
This burns a lot of muscle due to low calorie, low protein, lots of cardio... the body basically goes into starvation mode and as such eats muscle before fat. If I was to increase the calories to 2000 a day it would burn more fat then muscle but weight loss would be a slower process.
What you want to do on the other hand is lots of resistance exercise, in other words only do 30 minutes running or elliptical 5 days a week then lift weights, it doesn't even have to be gym weights. Next you want and I know this sounds crazy, but to eat a lot more calories then you normally would as long as you keep up the exercise routine 5 days a week (two days off for muscle recovery).
The trick here though is that it is healthy calories, a diet of steak, chicken, eggs, avacados, veggies, fruits, oatmeal, cream of wheat, weigh protein ( muscle building shake immediately after working out and a small portion of eggs before.) Do 1 hour of weight training each session (but do not work till muscle failure, it will actually decrease muscle size).
With this you will build both muscle and burn fat and quickly get more of a male figure.
