While Jackson's two-man form with John Baines has been hit and miss, they were 23rd at the World Cup opener before recording a ninth and then a 15th, he's only been going in one direction in the four-man.
Jackson was seventh at the first World Cup in Lake Placid then sixth in Park City last weekend while at the Olympic track from 2010 in Whistler he improved one place again to finish fifth.
The quartet of Jackson, Stuart Benson, Bruce Tasker and Joel Fearon were joint-fifth with Manuel Machata's German No.1 sled after the first run after clocking 51.86seconds.
However they were fifth outright after their second outing, despite recording a slower effort of 52.15, as Machata also failed to match his time from the first run, trailing the Brits by 0.04.
However for all they impressed Jackson and the British four-man team are still a long way off Zubkov who eased to a third successive victory from three in the World Cup this season.
Zubkov, alongside Alexey Negodaylo, Dmitry Trunenkov and Maxim Mokrousov, edged out the Russian No.2 sled, driven by Alexander Kasjanov, by 0.24, clocking 51.63 and 51.66 for 1:43.29minutes overall.
Christopher Spring drove the Canadian No.2 sled to third a further 0.3 back to deny American Steven Holcomb, who was fourth, a third top-three finish in a row in the four-man after two seconds previously.
And, to underline the little work needed to be done by Jackson in order to break into the top three on the World Cup circuit, he was 0.18 shy of Spring although 0.72 away from Zubkov.
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- Manuel Machata