Fink was referring to Wednesday's 2-2 draw at Borussia Monchengladbach which followed on from Saturday's equally impressive 3-2 defeat of defending champions Borussia Dortmund.
"Up until the 91st minute, I was pleased with everything," he said.
A last-gasp equaliser from Alvaro Dominguez prevented Hamburg winning but that should not detract from what had gone before it.
"I am still frustrated about the two points we threw away," he said. "We latched onto our game against Dortmund in Gladbach and maybe we worked even harder."
Fink is likely to name an unchanged side for the derby clash with Hannover.
"We have to see who is fit," said Fink. "At the moment, the team is so harmonised that I have to see if it is a good idea to tear it apart.
"I will have to see in training, but it is good for any coach to have other options up his sleeve."
Hannover coach Mirko Slomka has one option less for the next six months after his side's injury-plagued midfielder Leon Andreasen tore knee ligaments in midweek.
The Dane, who has just returned from over two years out with a groin problem, has been ruled out until the new year.
"It is a bad diagnosis for Leon, who has had an eternity of injury problems behind him, but it also hits the team hard because we have to replace a really strong player," said Slomka.