Those are Shimano M515's, right? You might want to loosen the spring tension almost to the limits. On a touring bike, even when you sprint you're not likely to be pulling so hard as to accidentally unclip, but the loose tension will make it almost impossible
not to unclip in a low-speed emergency (more likely on a loaded tourer). Just flailing your feet around should be enough to pull out.
The Shimano instruction sheet for the pedals should have been included with the bike. If not, check with the bike shop. These are also usually available on
www.shimano-europe.com, but their server seems to be down at the moment. In a pinch, let me know and I'll scan and e-mail you a copy of mine.
RichC