Rovers were without a win on the road from their previous seven and without a goal in their last four matches.
But both of those runs came to an end with a comfortable win at strugglers Cardiff City.
Andi Weimann scored early in both halves to claim his first goals since August.
David Turnbull pulled a goal back for the hosts before Lewis Baker sealed Rovers’ first win in five games with a perfectly-placed shot four minutes from time.
Eustace said: “I thought we were excellent. We played really good possession football and were clinical.
“We scored a fantastic first goal after about 40 passes. That goal was pure quality and the way we got upfield was just outstanding.
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