While the profitable Southland circuit finished over the weekend, there are five Forbury Park meetings to go this season, which are often the scene of multiple wins for Dunn.
But complicating Dunn's equation is the fact he will miss the last weekend of the season as he heads to North America for a brief holiday before his defence of the World Driver's title in Canada in August.
Dunn won the series in Australia two years ago and says it takes priority over breaking the national wins record.
"I can't wait to get over there because it is a great series and you learn so much," he says.
"Not only is it special to represent your country but you make a lot of friends and learn things from all the other drivers.
"It will be my third championships and it is the highlight of the season."
Dunn wants to travel to the championships via New York to take in Hambletonian Day at the Meadowlands so will miss the final two meetings of his season at Addigton and Oamaru.
"That could potentially end up costing me getting past 220 but it doesn't bother you as much when it is your own record," he admits.
"But if I get to 218 or something with a week to go then I might not see it that way.
"It would be cool to reset the record and I think it is possibly on because the Forbury meetings tend to be pretty good to me and I don't have any Australian commitments coming up."
With another 200-win season just one away Dunn will continue a scarcely believable average of just over 200 wins per season for the ninth straight year, even more remarkable because nobody else has ever achieved the feat even once.
"I'm on 199 now and not being stuck on that is one of the most important things, because I've finished two seasons on 199 and that sucked.
"But I should get well past that and considering how long a season it has been I am feeling pretty fresh.
"I haven't had as much travel to Australia this season, which has helped."
Dunn says while his strike rate is better now than ever, driving a winner every 4.7 drives, he drives more "ugly races" now then he used to.
"The racing has changed so much in the last five years," he offers.
"You used to be able to sit back and drive them pretty and come with one run when I first started driving but now you have to be on the speed a lot more.
"The odd one can still come from back in the field but on the whole you need to be on the speed because they just keep running."
If Dunn does get surpass his 220 seasonal record he could also join another very elite club as he sits on 1978 career wins in New Zealand, meaning he could top 2000 before the end of the term if he has a stellar next six weeks.
Only Tony Herlihy, Maurice McKendry, Ricky May and David Butcher have driven over 2000 winners in New Zealand, with Colin De Filippi knocking on the door with 1997 career victories here. The biggest difference: Dunn is 25 years younger than any other member of the club.
And if he keeps winning at his current rate he would become New Zealand's first 4000-win horseperson of any code before his 38th birthday.
10
Heading for 10th straight national premiership.
203
Averaging 203 wins per season over last eight years.
220
Already holds NZ record for wins in a season at 220.
no1
Current World Driving Champ
22
Wins away from joining elite 2000 wins in New Zealand club.
4.7
Strike rate of win every 4.7 drives.