If you still want to have david.piechnik.ca redirect to piechnik.ca/david/, you can do the following:
On the Full Hosted settings page for david.piechnik.ca, scroll down to the Redirect section. Enter a redirect URL:
Redirect to URL: http://piechnik.ca/david/
And click the “Redirect this domain” button.
Now david.piechnik.ca is redirected to piechnik.ca. The redirection is marked a “permanent”, which means that search-engine’s (Google, etc) will use the redirected URL as the official URL.