My updated questions are:

If I did the whole car in Ultimate Compound by DA, before waxing (Ultimate Wax), would it be OK to follow up with Ultimate Polish & then M07?

The factory painted (same colour) plastic trim along the side of the car and rear spoiler; have faded to a dull matt red. The Ultimate Compound helped it a little bit but not much. Does single stage factory painted trim & spoilers tend to dry out more than painted metal, so that I should replenish by M07 or is it usually something else?

Looking at all the curved panels & nooks & crannies, the 7" standard foam pad would not sit flat on the panels, except the hood. Is that OK or would it cause product to spin off? So would 4" pads be acceptable/recommended for the whole car?

Thanks very much,
James