Montgomerie, who has struggled this season, was on the brink of a maiden major win at last year's US Open before he double bogeyed 18 to lose by one.
But, after his showing at Celtic Manor, he said: "I know what I'm doing now.
"I'm more comfortable than I was going to the US Open last year and my appetite is as strong as ever."
Montgomerie's closing round was not enough to contend for the title, following a third-round 73, but it was a welcome return to form for a player who has gone 18 months without a victory - his longest barren run for 16 years.
"My golf couldn't go on like it was," he said. "Something had to change. It couldn't get worse - not for someone, shall we say, of my ability.
"I've had a dreadful time the last few months, but now I'm feeling good again."
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