Few people know what their true max hr is but 177 is a pretty high percentage of max for anyone! That would be like an intense race effort unless you have a really above average max. My max is in the 180’s probably mid to low . My HR monitor on the Garmin and the treadmill are always the same , maybe +or – 1, but you can check that.

I never use those programs , I choose manual mode and make adjustments to the treadmill to what I want as needed.