Tuesday's third-round tie at the Kiyan Price Foundation Stadium saw Benitez's men crash out on penalties after a 2-2 draw.
Benitez told evertontv: "The most difficult thing to improve, normally, is in attack because it depends on the quality of players, but we are creating chances, so I am sure we will score goals.
"But in defence we have to be more aware of what is going on around and be sure we defend as a team, and then (if) we are strong enough in defence, that will give you the possibility to win games.
"You have to build the momentum from a solid team. At the same time, we are creating chances, so we have to find this balance that still we cannot find."
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