Hi Sashav,
Not to beat a dead horse, but did you adjust the internal output switches in the Wadia for highest output voltage(0.3V to 4.25V) and set the 7BSST to 1V input sensitivity when you tried the Transformer Volume Control(TVC)?
Seems odd that such a bad performance resulted because, on paper, your system should have been perfect for a TVC with the Wadia's high output voltage and low output impedance of 15 ohms into the the Bryston's 1V input sensitivity and 20Kohm balanced input impedance.
Not to beat a dead horse, but did you adjust the internal output switches in the Wadia for highest output voltage(0.3V to 4.25V) and set the 7BSST to 1V input sensitivity when you tried the Transformer Volume Control(TVC)?
Seems odd that such a bad performance resulted because, on paper, your system should have been perfect for a TVC with the Wadia's high output voltage and low output impedance of 15 ohms into the the Bryston's 1V input sensitivity and 20Kohm balanced input impedance.