Are my Canonical Links set up correctly?

[GreenFarmParts]

I have Enable Canonical Links (recommended) on my web site.  However, I also have THIS checked:  Enable full URL for Home Page Canonical Link (include /default.asp)  Is it hurting me???  Keep getting dinged on our report card.  We are using the Volusion shopping cart software/platform.

[StreamlineMetrics]

If you don't enable the full URL for the homepage, is the homepage canonical URL set to http://www.site.com? If so, I would recommend setting that as the canonical URL instead of http://www.site.com/default.asp.

[PartyStore]

I too also have this option checked in volusion seo settings "Enable full URL for Home Page Canonical Link (include /default.asp)"  Is this option suppose to be checked for optimal SEO performance?