Benitez admits they must find a way to break down opposition who arrive in west London with limited attacking ambition.
"We are doing well away but at home other teams play deep and wait and there's less space," he said.
"We are still creating chances but the main thing is to be more clinical. "If we take our chances it will be totally different because the teams we play will be more open and we will have the space we're looking for.
"But if that's not the case, as in the last two games, it is more difficult.
"When you play away there is more space, the players we have can make a big difference. If you have 11 players behind the ball you have to find the space and be more precise.
"We have confidence that we can do well. We scored many goals against Aston Villa and Nordsjaelland.
"The last two games were more difficult because they had 11 players behind the ball and we have to find a way to overcome that."