Reflecting on the Petone match, which was drawn 2-2, Keinzley said his side frequently played the ball through the middle of the Howard Booth Park ground rather than utilise the pace of former Vanuatu international Seule Soromon and promising newcomer Omar Guardiola out wide.
"We didn't give them enough chances to use their speed to outflank the defence, and that's clearly something we need to work on, "Keinzley said. "When you have that sort of pace you have to make the most of it."
His side had also tended to give the Petone midfield too much time to weigh up their attacking options.
"We didn't close them down quickly enough, we needed to be more assertive with our defence."
It wasn't all doom and gloom, though, not by a long chalk.
Against a Petone side who were unbeaten in the Hilton Petone pre-season series, Wairarapa United measured up surprisingly well in terms of fitness.
Then, when they did manage to string a few passes together, it was easy to see the considerable attacking potential of Soromon, Guardiola and Nick Roydhouse, whose high workrate belied the fact he was playing his first serious game for about two years.
As well, good signs were seen from regulars Waisake Sabatu, Nathan Cooksley and Adam Cowan at the back of the defence, while a couple of the Heartland Wairarapa youth team, Liam Hare and Mark Hemi, looked sharp too.
For two of the "imports", Fijian striker Apisai Smith and Chilean midfield Maximiliano Lopaz, it was a relatively quiet day at the office but Keinzley saw enough to suggest the pair should become integral members of the Central League squad as the season progresses.
"They are still finding their feet but you could see the skill levels, they will be very handy," he said.
The Wairarapa United seconds also had their first hit-out at the weekend, scoring a comfortable win over fellow Capital Football second division side Douglas Villa.
Heartland Wairarapa skipper Thomas Hemi had a "blinder" of a performance on attack and Alex Cox was outstanding at right fullback.
