Klm md-11, you're probably right about KLM's loadfactors on the AMS-YVR route after peak season. Last year Vancouver featured regularly as a "Call and Go" offer (very very very cheap tickets). As KLM only releases seats for these tickets if a flight isn't doing well (which means poor load factor) AMS-YVR isn't very busy after peak season.
My source for KLM Timetable information is http://www.schiphol.nl
. Go to the Flight information section and then flight schedules.