On Hub-pages the editors don't like to see whole titles in caps. You'd get a marker on your 'Account' page to show they'd like to see a mix of caps and smalls.
I tend to set down a main headline in caps and then a mixed sub-header. That keeps them happy. In the main it's considered to be like 'shouting' in print when you have more than the 'banner' in caps. For a guideline look in a newspaper.
A front page banner headline will have a sub-heading in the form of an 'appetiser' or quote. This is to draw you in. After that you have column sub-headings in the same article to guide you through. Inside the paper or periodical you have headings of unrelated articles in caps and then caps and smalls after that. That's the practice.
Think of Hub-pages as a newspaper/periodical in which you are one of any number of contributors. When you're a 'rookie reporter' your report gets 'buried' amongst syndicated articles, On your way up the ladder your contribution will carry more weight.
I've had my own sub-domain a couple of years now, but I still have to toe the line.
Enjoy the read. AL