The pair completed their final training runs in Russia earlier this month and will not be allowed back on until the Winter Games commence in February.
They compete in the season-opening Calgary World Cup this weekend.
"With Vancouver I clicked straight away, but with this [Sochi] I have struggled," Walker told BBC Sport.
"It's incredibly difficult to be quick on the track because of the three uphill sections, which can be challenging.
"If you make a mistake you're not losing a couple of hundredths of a second, like on other tracks, you're talking tenths of a second - which in bobsleigh is catastrophic."
Safety concerns were raised over the Vancouver 2010 Olympic sliding centre, located in the Canadian Whistler mountains, following the death of Georgia's luge athlete Nodar Kumaritashvili.
However, Jackson - who crashed twice at the last Winter Olympics - insists safety is not an issue this time around.
"The difference with the track in Whistler was you had to be that much more accurate during the fastest part of the course and there wasn't much scope to be off the racing line, because that's where people ran into trouble," he said.
Walker, 27, continued: "To be honest, it's quite an easy track to drive - not like in Vancouver where there were parts you wondered if you'd make it through - it's just a case of trying to be fast.
"By the end of training, though, we're both feeling good about the course and are confident we can do well on it next year."
Walker's partnership with Gillian Cooke showed promise last season, but following intensive testing in training over the summer months Rebekah Wilson has now joined as brakesman in the women's lead two-man crew.
"Gillian [Cooke] is a fantastic athlete and no worse this year, it's just that Rebekah has just made such huge gains," said pilot Walker.
"For me it's brilliant because I know that I've been on the cusp of doing something special in the World Cup and now I have Rebekah who's physically better it's only going to help my cause.
Jackson, 36, has made a remarkable recovery from a ruptured Achilles tendon - which he suffered in August - but still may not push the bobsleigh in the season-opening World Cup event.
"There is the option to sit in at the start and be pushed by the other guys, who will just jump in behind me," revealed Jackson.
"My rehabilitation is going really well but I'm not at 100% intensity with sprinting and pushing yet, so it's about minimising the risk of any further injuries."
While podium finishes always help build confidence the priority for the British Bobsleigh squad is to claim as many world ranking points as possible over the coming months.
In order to achieve the maximum number of Sochi Olympic qualifying places they can realistically attain - two in each discipline - GB must have two women's teams placed in the top-14 nations and two men's teams ranked in the top-20 come the end of the qualification period on 19 January.
With that in mind, the second- and third-choice teams have started their season on the lower-ranked American Cup circuit.
GBR 2 pilot Lamin Deen guided his four-man crew to gold and silver medals in Park City on Tuesday, while Vicky Olayoe and Mica McNeill have also performed well.
"They've made an excellent start in a strong field," GB Bobsleigh performance director Gary Anderson told BBC Sport.
"Although the races aren't worth as many points as the World Cup events they are still incredibly important to have in the bag.
"I would quite happily gain the minimum number of points that we need to qualify and then in Sochi top the podium - that would be brilliant."