I am running a TACX T2060 and also have a Garmin Vector 2. In the pairing screen I can see my smart trainer as well as the Garmin and the power outputs. There is a power discrepancy of about 20 Watts between the two. It appears to me that the TACX is overstating my wattage but either way I am now unsure as to which device is the most accurate and which one to use. Any reason for this? Is there a way to calibrate the trainer to Zwift?