His partner, Jade Makuru, said after Rowles' sentence was reduced last year they feared the same would happen to Taylor's sentence.
"We didn't really have our hopes up after the other appeal but we're pretty happy with the outcome of this one this time."
Taylor's lawyer, Marie Taylor-Cyphers, appealed the length of the sentence as he felt aggrieved he was charged with attempted murder and Rowles was not.
In the Court of Appeal's decision released to the Otago Daily Times, Taylor-Cyphers said the grounds for the appeal related to Taylor's intent. In order to find Taylor guilty of attempted murder, the jury in the original trial was required to be sure he intended to kill Vincent. Taylor-Cyphers placed weight on the fact no weapons were used in the attack as well as the fact Taylor kicked Vincent in the ribs, which had no logical connection to an intent to kill.
In its decision, the court ruled there were no grounds for Taylor's sentence to be shortened and considered the distinction between his sentence and Rowles' to be justifiable.
Makuru said the family now hoped they would not hear anything about the two until they were released from prison.
Vincent still suffered from fatigue and anxiety caused by the attack but liked to look on the positive side of life, Makuru said.
The couple's young children Vana, 5, and Kobe, 3, were also happy to have their dad back.
"It's still hard for Kahu to get out in public and do family and stuff but it is definitely getting better."
Another milestone the couple were looking forward to was getting married next year after Vincent proposed on New Year's Eve.
"That was another thing out of Kahu's comfort zone," she said with a laugh.