Correct, all or your (R) settings are for custom tailoring your power output.
While I have not used them(I'm lazy that way) other that have seem to like the results.
Say you like short draws, or have lung issues that do not allow you to take long draws(shortness of breath)
The coil may not heat up properly to Vaporize
e-liquid
Poor solution Crank up the Volts
Better solution - Raise output to (x) for .5 seconds, reduce to (Y) for 1.5 seconds, continue at (Z) for 6 seconds.
Now you can come on strong and level off lower to keep juice from burning.
