Phil, I've not done the RS VFR tour but looking at the published itinerary, you don't really have time to do the Palatine or Capitoline on Sunday, or probably not without skipping the group walk, anyway. Remember, that it's only a PARTIAL day in Rome, according to the online itinerary, and I'll assume the walk begins in the afternoon after everyone is checked into the tour hotel and settled. Dinner follows at the completion of the walk.
Again, as you'll essentially be AT the Palatine after you finish the Forum on Day 9 (I'll assume they do that one AFTER the Colosseum), as they're connected inside the security fences, it doesn't really make sense to do it on a different day, especially as it would involve a ticket to do so. The only one which might work is the Capitoline but again, it depends on what time the tour arrives in Rome, and how much time you'd have between arrival, check-in and group walk/dinner.
Editing to add, as Alexandra's material states that, "The best time to book your (Borghese) visit is after 12:30 pm on Day 8" and there's no mention of Day 7, I might assume there's no time for the Borghese on Day 7, should Day 8 be a Monday. That indicates that there's no time for the Capitoline either.