My KICKR SNAP seems to be surging or putting on high resistance.
What may be needed is a recalibration then an "Advanced Spindown", both using Wahoo's Fitness app. Use that app to make sure your firmware is up-to-date then go through the calibration process. You should then also see an option for the Advanced Spindown if the app thinks you need it.
Go through that process then shut down bluetooth on your phone then load up PerfPRO. See if the resistance changes are a little better. If you have access to your mouse while riding or have the PerfPRO Remote App then go into Manual Ride mode and start the workout. You can then change resistances on the fly to whatever you want and see how the trainer reacts.