Queens Park Rangers beat Birmingham City 2-0 in their most recent fixture.
Hasselbaink made three changes to QPR’s line-up on Saturday, and they had the desired impact - as the London club picked up a comfortable 3-0 victory.
Tjarron Chery and Junior Hoilett scored the goals for the R’s, and Perch feels that the pair added a lot to his side’s attack.
"The injection of enthusiasm and pace from Junior (Hoilett) and Chezza was needed,” he said."I thought the gaffer got that spot on and they were both brilliant.”
Perch also played against Birmingham, and he was solid, despite being selected in the more unfamiliar position of left-back.
QPR’s display was arguably their finest under Hasselbaink so far, as the Dutchman has made a rather slow start.
Rangers have won just three of their first 15 matches under the guidance of the former Burton Albion boss, but there have been signs of progression in recent weeks.
QPR are now unbeaten in their last three matches, and they have climbed up to 11th place in the Championship table.
Hasselbaink’s men are next in action at the weekend, when they take on relegation threatened Milton Keynes Dons at stadium:mk.