Have you tried using rewind_posts()?
It looks to me like what you’ll have to do is either run the entire query only outputting titles then rewind and output content (however this would output all titles before the content, not in blocks of 5 as you have suggested) or wrap everything in a loop which runs the same query limited to 5 posts each time, then increment the offset parameter by 5 each time (Pagination Parameters).
EDIT: Your third, potentially long-winded, solution is to save 5-title blocks and 5-content blocks into separate arrays, then print them out at the end in the order you want.