Hi Ivan,
I’ll just suggest you to limit the number of points for ways, GPS recording contain a lot of noise, so don’t hesitate the only use two points when this roughly looks a straight line, this will save you a lot of time and most of the time, this will look nicer on maps.
If you use JOSM to import those GPX files, there a very useful “Simplify” tool to greatly reduce the number of points.
Also, “surface” and “smoothness” keys are often appreciated to plan some biking trip, even if in theses changesets, since this a private property, it won’t be much useful for other users but you may want add public ways.