* March WCS quoted at $26.75/bbl under WTI * March synthetic $0.65/bbl over WTI * Apportionment eases, Kearl start-up pushed back CALGARY, Alberta, Feb 6 (Reuters) - Canadian heavy crude prices climbed to their highest point in 12 weeks on Wednesday on the back of reduced pipeline congestion and speculation that some players may have been caught short, trading sources said. Western Canada Select heavy blend for March delivery last sold for $26.75 a barrel under benchmark West Te