[CharlesW]

I have no idea as to how aggressive the ScratchX is nor do I know what a green Edge pad is intended for, but....
I have had good luck with:
Poorboy's SSR 2.5 or Meguiar's #83 DACP and a polishing pad. Some paint will finish ready for your LSP, but you might need to follow up with a less aggressive polish.
I have never needed to do an entire vehicle with the SSR 2.5 or the #83. I usually just had to hit a few spots with something that aggressive.

In most cases, Meguiar's #80 Speed Glaze and a polishing pad is as aggressive as I have had to be on an entire vehicle. The #80 has finished up to where I could go directly to my LSP.
I would not use a sealant over the #80 without using a paint cleaner prep between the #80 and a sealant.
The one exception has been Meg's NXT and I don't know how the new NXT 2.0 will work over #80.

For a paint cleaner prep I use Klasse AIO, Optimum Poli-Seal or Poorboy's Polish with Sealant. All have worked good and it's just a matter of which one I pick up for me.