Jones has led Warren Gatland’s men to 43-14 and 29-25 victories over Georgia and Australia respectively in Japan so far and will captain the team once again in the meeting with Fiji in Oita on Wednesday.
“We had a few days off to recover, recuperate and travel after Australia,” the 34-year-old said.
“We had a day of training with tailor made sessions and now we’re into the latter stages of our Test week. With regards to where we are we’re very aware we’ve only done half a job.
“We’re halfway through the pool stages with two games down and two to go. We’ve had two great starts, but potentially taken our foot off the gas in the latter parts of those two games.
“We want an 80-minute performance in defence. Shaun Edwards has urged that from us, but Stephen Jones has also told us still to keep on playing in attack.
“The nice thing is we still have improvement to make in key areas to take us to the end of the pool stages.”
After facing Fiji, Wales will complete their Pool D clashes by taking on Uruguay in Kumamoto on Sunday.
“We’ve had two incomplete performances. I don’t think there is such a thing as a perfect game, but we just need to keep working hard and use the time wisely,” Jones added.
“Time is increasingly finite at this stage of the campaign, but hopefully we can put the product out on the park.”
Jones – who won a Welsh record-breaking 130th cap against Australia – is the only member of the current Wales set-up who played in the 2007 World Cup defeat by Fiji in Nantes.
The two sides have met in the two global tournaments since and will do so again on Wednesday.
Skipper Jones will be telling his team to be right on the money.
“If you look at the leagues the Fiji players play in across the world, their players usually focus around the most exciting aspects in those leagues,” he said.
“We know their offload ability and how dangerous they can be and if you couple that with some interesting set-piece plays, we will have to be on our guard.
“Whether you’re playing in an autumn campaign or a World Cup, Fiji are always dangerous and we’re well aware of the individual threats they have.”