Usuthu bounced back from a 4-1 drubbing by neighbours Golden Arrows last Sunday courtesy of a stunning Michael Morton strike and brace from fellow new signing Rhulani Manzini at King Zwelithini Stadium.
The contest was marred by Morton's late dismissal for shoving Hellings Mhango to the ground after being spat at.
The Premiership returnees, in seventh spot on the table with seven points from five games, next host bottom-placed Platinum Stars this Saturday.
“We shouldn’t get carried away with ourselves,” Johnson told his club's website. “When I look at the game against Golden Arrows, I thought we played a better game. I think the boys put in a shift tonight [Wednesday], they really played well.
“I thought we scored two cracker goals, really, really nice goals, the build up and Michael Morton finishing, and the one Rhulani Manzini finished.
“I thought they both did very well and credit must go to the boys as a group, it's not about Cavin Johnson, it's not about Rhulani Manzini or Michael Morton, it's about AmaZulu FC.
“We know where we’re coming from, we know where we have to go to, we know how we have to build.”
The former Dikwena and SuperSport United mentor continued: “Don’t take anything away from Wits they were there but I think they didn’t get that many clear cut chances. The one they got from [Kobamelo] Kodisang I thought [Boysen] Mbatha did a fantastic job in dealing with it.
“The first half we played a lot better, second half we defended better, because we knew they were going to throw everything at us and we had to come out somehow. We came out and I think the goal by Rhulani was a result of a counter attack.
“Credit must go to the boys, they played against a good team with a lot of quality and a lot of internationals in their team.
“Some of my boys are playing for the first time in the PSL, some of them have not played more than 20 minutes. So I have to give credit to the them, they really put their hands up.”