Pompey have taken maximum points from their opening two games this season.
But Gareth Evans is adamant that the Blues can get even better following victories over Luton and Blackpool.
A Ronan Curtis brace saw them cruising at Bloomfield Road on Saturday, before Mark Cullen grabbed a late consolation.
Evans felt it was sloppy to concede in the closing stages, but was happy with the overall performance.
He said: “We changed formation a bit because we were a bit disappointed about not having enough of the ball the previous Saturday.
“I felt we made up for that a bit this time and it was more of an attacking system – which was gutsy away from home.
"There’s a lot for us to improve on and I’m sure we can iron out a few creases in the next few weeks."
“Ronan has been excellent ever since he came through the door. He’s really professional and has shown what he’s capable of.
“But we did concede a poor goal right at the end and spoke about that in the dressing room afterwards.
“Up until that point we dominated the game and had some really good passages of play – overall it was a pleasing performance.
“Of course it’s a positive thing that we’ve got maximum points from our two games, but there’s a lot for us to improve on and I’m sure we can iron out a few creases in the next few weeks.”
Evans was named captain against Blackpool, with regular skipper Brett Pitman only among the substitutes.
He said: “I’m proud to wear the armband, but even more pleased just to be back in the starting line-up.
“Hopefully now I can keep my place there because I really want to get a run of games going and help the team.”