"His last run, he was ridden against his pattern and he got tired the last 150, but he put himself in the race and was really strong until that 150, whereas in previous preps if he'd have been ridden like that, he would have really dropped out," Vahala said.
"His run before that, running second to probably WA's best horse in Cosmic Crusader, that was a big run as well. So without winning, he's been very good."
Aztec Ruler drew barrier six in Saturday's field of 12, which Vahala was happy with and he is excited about seeing him up the straight again after the benefit of last year's experience.
"I think he enjoys the straight, it really suits him," he said.
"He can really get into a rhythm and then let down that last 300, which is sort of his racing pattern.
"He travelled in Mondy night, he settled in beautifully, and I think that extra 12 months and that previous travel has definitely helped him."
Top WA jockey Chris Parnham has ridden Aztec Ruler at his past two starts and will jet in for the Standish Handicap ride.