Boric made his Super 14 rugby debut away to the New South Wales Waratahs in 2006 and and came off the field having been part of a 43-9 defeat, the biggest the Blues have suffered against their New South Wales rivals.
He was back again two years ago when the visitors were again humbled, this time by by 37-16.
"I don't know why it is really, but for some reason we've played quite poorly over there," Boric said.
"It's a real challenge for us to get over there and focus mentally."
The Blues are coming off an encouraging 39-34 bonus-point victory over the ACT Brumbies, with powerful centre Rene Ranger's star turn putting the gloss on skipper Keven Mealamu's 100th appearance for the franchise.
That result came after a loss and the bye, and pushed them up one place to ninth, four points and five places behind the Waratahs.
"It's a good start," Boric said, "but we know the Waratahs in Sydney is going to require another step up from us."
One area the Blues are looking for continued improvement is their lineout, which Boric admitted had been up and down this season.
There had been a bit of experimentation, which hadn't yet borne full fruit, while unforced errors were a source of frustration.
"That's the big thing we talk about every time it doesn't go well -- it's our own errors, just little execution things, and technique and timing," he said.
"It's just a matter perhaps of doing a bit of repetition and ironing out those little things to make it how we want it."
With fellow-All Black Ali Williams out with a season-ending Achilles injury, the 13-test Boric, 26, has had the mantle of senior lock thrust on him.
"There's definitely a lot of extra responsibility, but everybody else pitches in and helps out," he said.
"It's not as if it's just me making the decisions. Everyone is contributing."
He wasn't entirely happy with his own form so far this season, believing he had made a slow start and was looking to pick things up over the coming weeks.
Coach Pat Lam said trying to eradicate lapses in concentration had been an area the Blues had highlighted this week.
He said one bad scrum could wipe out a pack's reputation built on 10 great scrums, and he felt his forwards had eased off a couple to times on the Brumbies' put-in last week.
"The same with the lineout," he said. "We were nine out of 12, and the three were all our errors."
He said it took only one or two players to drop their guard for all eight forwards to suffer.
