I bought a KICKR gen1. I connected it to ZWIFT through ANT+ (MAC OS). I selected like Power FE-C. The problems are in the speed and resistence of the trainer. The resistence fluctues a lot at the same slope, and if I stop to pedaling, the speed inmediately goes to cero,Other issues is in the power, It is slightly down from my garmin vector and elite drivo (around 20-30ws).
First things first if you have not already done so is download “Wahoo utility app” Make sure the firmware is up to date and do a spin down test. Make sure the bluetooth feature is turned on in your phone. The phone will probably prompt you if not. Further here:https://support.zwift.com/hc/en-us/articles/202586229–Setting-up-a-Wahoo-KICKR