First of all, it's not recommended to use components at their maximum rated power or very close to it. You should always leave some "room", at the very least 10-20% to make sure your circuit will not fail or misbehave due to overload.
Second of all, you can set the output voltage from the transformer with resistors connected to RFB, RREF and TC pins of the LT3002, as specified in its datasheet on page 5:
The ratio of the RFB resistor to the RREF resistor, times the internal voltage reference, determines the output voltage (plus the effect of any non-unity transformer turns ratio).
Third of all, do you really need the LDO at the output? Do you know why are you using it?