My experience working as a reading tutor is that boys like non-fiction. Either that or super stupid fiction, like Captain Underpants or Diary of the Wimpy Kid. They don't really relate to fiction chapter-type books the way girls seem to.
Really untrue for my 5yo boy (6 in spring). He loves fiction chapter books and has been reading them for a good long while now.
I suspect that it is true of the reluctant readers that are likely to end up with a reading tutor. I think that in some cases, the only reason a "tutor" is needed is because the parents are trying to dictate the child's tastes.
That said, I endorse your list of books to try. But I'd also try nonfiction, and picture books, and see what sticks. My son enjoyed
The Boy Who Loved Math, a picture book about the life of Paul Erdös.
