I think Google is right here. If you mark something as a sequence, it is reasonable to presume that the start of the sequence is the normal entry point, in this case the front page of your blog.
Personally, the obsession about date order in blogs is overdone. It is not a book, there are no real dependencies between chapters. My blog is not a sequence (unless I happen to say write a three part article on some subject, where there would be a short sequence here). Sure it has a date order, but semantically thats not very important. I am not self important enough to believe anyone reads it in order. If people want to read by date, you can provide a date index or calendar view, but that does not have to imply a rel=next/prev sequence on that view.