Okay, I'll give one of your questions an answers: Sorting the radii descending:
If you only have your sectors in the cosmetic layer, save the cosmetic objects into a new table via Map > Save Cosmetic Layer...
Go to Query > SQL Select and fill in the dialog like this:
Select Columns: Area(OBJ, "sq m") "Area_sqm", COL1
From Tables: <your radii table>
Order By Columns: Area_sqm Desc
You need to calculate the area and "add" that as a column. I have done this using this expression: Area(OBJ, "sq m") "Area_sqm". You can add as many of your other columns from the table as you like as well but you need to add them explicitly. In the example above I have only added one additional column - the first in your table.
Now add the query result to you map window and turn off the display of your radii table.
When you add a query to the map MapInfo Pro doesn't use the spatial index when drawing the objects. MapInfo Pro draws them in the order the objects have in the query. Therefor ordering the table with the larger objects first will make MapInfo Pro draw these first and then the smaller object on top.