Smudge Issue...?

I have a canon Selphi (sp? idc) and I'm printing out postcard invites, which look great with excellent quality for the $$ out... my problem is, between the lexmark e320 and the canon pixma ip600D, I CANNOT get a quality print out on the back of the postcard.. to address, map for directions, etc... the face of the postcard from the slephi is great... but the back for printing purposes sucks... i've tried all the various ink settings... am I missing something???