Swirls should be much easier to remove than scratches. WG TSR is pretty nice before moving to a finish polish on its own, so I have a hard time thinking that TSR is the issue.
On black paint. Everything shows. Check your MF towels. I like edgeless towels for finish polish and wax removal. Make sure that the edges are soft and not hot wire cut.
I almost always use a white or blue pad to gloss polish after an orange pad for correction. Make sure the pad is clean. If the pad hits the ground, consider it dirty.
If you have left over polish on the paint or on a MF towel, it can look like swirls in the paint. Been there, done that. Try a good clean MF and detail spray like Megs Mirror Glaze to see if you have leftover polish on the paint. I found that I needed to use detail spray to remove residue from a Black Porsche last summer when it got really hot in the garage.
You can use either mineral spirts or IPA to remove any remaining polish residue before adding the LSP. Some prefer a prewax paint cleaner such as the Pinnacle. Others may prefer a glaze to clean and fill any remaining fine swirls before the wax.
I personally have used One Grand, Pinnacle, Four Star and Ultima prewax cleaners over the years. I have used Megs #7, One Grand Omega Glaze and the new CG glaze which I can't remember it's name off hand.
Let us know how you fare.