Just to add on what Scottwax said, #3 and #7 are both glazes and have no cleaners in them. AIO has cleaning properties, I'm not 100% sure on VM so I won't say nothing there. #3 and #7 both do the same thing and that is to glaze paint and make it shine like mad.
I've never tried #3 but #7 like Scottwax said can be harder to use. It seems as if #7 is more suited for old school BC paint jobs. If you want to make your paint just ooze here's what I would do. This is only me, so whatever you want to do is ultimately your decision. I will assume your titanium paint has only minor defects.
1.) Wash with Gold Class or Hyper Wash. Or just whatever you like
2.) Clay with your fav clay and fav lube
3.) Polish with #80 with yellow polishing pad on rotary at about 1400RPM give or take
4.) AIO with polishing pad on PC at 4
5.)Menzerna FMJx3 finishing pad on PC set at 3.
As far as topping polymers with LSP's I have nothing against it. IMO, I think just about anything can be topped. Acrylics like Klasse can be topped no problem, Zaino, Megs, Menzerna etc... top them till your hearts content. Hope this helps alittle and good luck getting that titanium paint looking sharp. Titanium silver looks very cool when properly detailed,,,,,,AR