McIlroy has opted out of the European Tour's flagship event because he does not want to play four weeks in a row.
The world number three is returning from a three-week break to defend the Wells Fargo Championship in Charlotte.
"I am still working on it but I feel better than I did when I put the clubs away for a couple of weeks," he said.
The 27-year-old is the only member of the world's top five not to win a tournament in 2016.
Speaking to the Golf Channel, he added: "I'd got into a couple of bad habits leading up to the Masters and it's never really a good time to work on them - you are just trying to play golf and shoot a score.
"I took basically a full two weeks off from golf. I went home to Ireland for a week and then had a bit of a break; I was island-hopping for about 10 days, which was nice."
After the Wells Fargo at Quail Hollow, McIlroy will go on to compete in the Players' Championship and the Irish Open, where he will be tournament host at the K Club.
The four-time major winner will play in the Memorial Tournament in the United States a week after the Wentworth event in preparation for the US Open.
"The reason I took three weeks off after Augusta was that I'm not going to have more than a week off [at a time] until after the Ryder Cup in October," said the Northern Irishman.
"I'm playing here, next week at the Players, the Irish Open and then it's basically week on, week off from there.
"Memorial, week off, US Open, week off, French Open, week off, Open, week off, PGA, week off, Olympics, week off, Fed Ex Cup, Ryder Cup.
"There's a little bit of travel in there as well so it's a busy stretch coming up and you can't play every week."

The man posted a picture of himself holding the baby out of a window in a high-rise building with the caption: "1,000 likes or I will drop him."
It prompted other social media users to demand his arrest for child abuse.
He was charged with endangering the baby's safety following his arrest on Sunday, police said.
The child was dangled out of the 15th-floor window of an apartment block in the capital, Algiers, news site Al Arabiya reported.
The man, who is a relative of the child, denied he put his life at risk, saying the image had been altered by social media users, Algeria's privately owned Ennahar TV reported.
"The picture was taken in a balcony with protective barriers. These were removed," he was quoted as saying.
The child's father urged the court to forgive the man, saying he had just been playing a game.
However, the judge ruled against him, saying the picture was clear and the child's life was in danger.
Articles shared on social media about the incident got thousands of mostly angry reactions, reports BBC North Africa correspondent Rana Jawad.
Many Algerians insulted the man, and praised the authorities for arresting him and sentencing him, she adds.
Earlier reports incorrectly described the convicted man as the child's father.
Rory McIlroy has pulled out of the BMW PGA Championship at Wentworth later in May, but says he is close to removing the "bad habits" from his game.
[NEXT_CONCEPT]
A court in Algeria has sentenced a man to two years in prison for dangling a baby out of a window in order to attract "likes" on Facebook.