1. With PP smoothing set to "0" your Bike Computer is doing all the smoothing. If you're happy with what you are seeing on your bike computer screen there is no reason to change PP settings. Ppt setting does not affect the downloaded ride file.
2. You need to purchase the Powerstroke option. After you do your wasted watts and power stroke will be recorded on subsequent ride files
3. In the upper right corner of the main window, set units to metric
4. I would leave your ride file alone. It looks fine. No, you should not do a check calibration after each ride. Once your unit is dialed in (yours is) just ride...