Frank said: "We've finally got a bit of momentum. We had some very good performances recently, especially against Man United and Aston Villa.
"Today we performed very well and had some players back. It's remarkable that we still potentially were without four starts.
"I respect Rob Edwards and his staff and they make it difficult for every team, that comes here. We were very dominant and on top throughout the game, which interests me massively.
"We hit a top performance in many ways. We wanted Luton to earn the right to attack. We also knew we had to play off behind them when we had the chance. We found a good balance between the two."
"So pleasing for Wissa, scoring two goals, I was very happy for that. Keane (Lewis-Potter) also and (Kevin) Schade from the bench. Bryan (Mbeumo) was unlucky not to score but he assisted two."
On moving to the edge of safety, he added: "We knew that playing against Luton who were seven points below us, it was a big day. We want to keep this momentum going into next season.
"There's a very important game against Everton but this league is crazy and relentless. On a season when it's not going your way then it can be very difficult."