Watford are into the FA Cup quarterfinals after a battling 1-0 win at QPR on Friday night.
Etienne Capoue's finish on the stroke of half-time, after Tom Cleverley's mis-hit, proved the difference.
"We tried to do this in other games and we didn't score in the first moment with Tom Cleverley but we did in the second.
"We tried to defend a little higher because with this team [QPR] there are a lot of second balls and it's impossible to stop him [Matt Smith]. Heurelho Gomes played very well as well and we managed our line well.
On limiting his team changes, the manager added: "It's not easy because in the last games we played with other players. When I changed I know that all my players deserve to play and I trust all of them
"Today the game was different because we have more time to play and recover for the next one. When I choose the first 11 I think it's because they are best to complete that team."
Gracia is delighted to have his team now in the quarterfinals.
"I know all the games will be very hard. We knew Premier League teams have been knocked out against teams from other leagues so we knew this would be demanding game.
"We try to enjoy every game and prepare. Now we are focused on the next game against Cardiff.
"Our fans are enjoying the season not only with the Fa Cup but with the league as well. They can see the team giving everything and the results are coming."
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