SRP isn't a polish. It's got the word Polish in the name, but it's not a polish. It's a glaze. And a rubbish one at that.
Personal preference on soft paint is Scholl S20 Black & S30+(or S40) two stage combo for any proper correction, and Menz 2500 (PO203 in old terms) and 3000 (PO85RD in old terms) is my back up option.
That said, if the Megs stuff works for you then stick with what you know.
There's always an inherent risk with any cutting compound, it's just the finer the compound, the lighter the cut of the pad and the slower the machine is working at, the longer it'll take to do that damage (and get that correction for that matter...). It's more about using the product that you've got correctly for the job than using that one correct product.