Sure wouldn't hurt! I have to say I like red and gold as colors for LSP pads though but that's just me.
Dont really see a reason for a 4" waxing pad, I use the 5.5" for glaze/paint cleaner and for front bumper where a 4" may work I just do it by hand as it is easier. Other colors 4" would be useful as you already have.
+1 I would like to change my vote a 4inch black pad is just a waste of my time to use because it can be done by hand faster