In Densify Points screen, there are two main options: Spacing on Straight Segments and Spacing on Curved Segments. Which is simple and self explanatory.
In Reduce Points - you have Horizontal Tolerance and Vertical Tolerance which are a bit hit and miss with whatever values you enter and can take out too many points or not enough on the curved segments.
Therefore I suggest that the Reduce Points option be changed to have also "Spacing on Straight Segments" and "Spacing on Curved Segments" with "Delete" and "Retain" filtered points.
I don't think Topcon has done anything with this, as I put a similar requeat in over two years later via the 'talk to Topcon' box on the Topcon support website.