The board heard the inmate had "some difficulties with his conduct", though there had been improvements more recently.
After 10 sessions with a psychologist, there had been significant gains made.
"The psychologist noted, however, he can sometimes be verbose, superficial, reactive and defensive," Young said.
MacMillan was assessed as a medium risk of violent reoffending.
While the killer was keen to get out, the clinician proposed a different approach.
"[The report] recommended a rather slower release with possibly self-care, guided releases and whānau huis with his Probation officer and supporters to avoid the kind of circumstances that arose in 2020 that resulted in his recall."
Young urged Corrections to assist MacMillan with applications to release organisations before his next parole hearing in October.
In January the High Court declined to reinstate MacMillan's opiate pain medication for injuries he had sustained in a car crash.
MacMillan sought more than $12,000 in damages and costs and told the court the pain he was suffering was "like torture".
Justice Mark Woolford ruled it would be "totally inappropriate" for a court to second-guess a doctor's treatment decisions.