She won the women's 800m on Saturday by running from the front but reverted to familiar tactics when she completed the double in the 1500m.
"I'd never run from the front before," she said. "It's not something I normally do. I didn't have the confidence to do it before."
It was not a hard task at the Caledonian Ground at the weekend, because Hamblin was in a class of her own and was never challenged.
She won the 800m comfortably, in 2min 05.49sec, but had a harder struggle in the 1500m before winning in 4min 29.76sec from Kellie Palmer (Canterbury) 4min 30.06sec and Katie Wright (Auckland) 4min 30.33sec.
Her coach told her to go out hard in the 800m and complete the first lap in 60sec and then hold on.
She did it in 61sec but found it difficult.
"I had to make sure I kept something back for the last lap and could recover for the 1500m," Hamblin said.
She felt the pressure, slowed in the second lap, and came home in 64sec.
Conditions were different yesterday with a strong southerly blowing up the back straight and cold rain pouring down.
"I was not game to take them on from the front today," Hamblin said.
"The wind was too strong and I didn't think I could run from the front."
It was a stronger field with the other runners prepared to challenge the international.
"Just because I have a faster time it doesn't mean I can do it on the day," Hamblin said.
The pace was a dawdle with 59sec run for the first 300m. The third lap was a slow 75sec.
But the pace gingered up at the bell and Hamblin had to run 62sec for the last 400m to take the title. Kellie and Wright were timed at 63sec.
Racing fast in the New Zealand season is not Hamblin's objective. She is looking for fast times when she races in the northern hemisphere during our winter.
Hamblin ran the double successfully in Delhi but realises it will be more difficult at the London Olympics next year and will concentrate on the 1500m.
Hamblin (22), who emigrated to New Zealand from Dorset, in England, four years ago and gained citizenship in 2009, has a best 800m time of 1min 59.66sec and is the New Zealand record holder in the 1500m with 4min 05.93sec.
She wants to run faster in both events and will be concentrating on developing more speed this year.
The weather was fine for two and a-half days of the championships but the southerly came through early yesterday afternoon and made conditions difficult.
The only event that had to be cancelled was the men's 19 pole vault because the wet run-up made the event too dangerous.
Hamish Carson (Wellington) sprinted the last lap in 60sec to win the men's 1500m in 3min 53.59sec from Hayden McLaren (Canterbury) 3min 53.78sec.
McLaren stepped up the pace with 450m to go and Carson clung to his boot strings down the back straight and around the top bend before unleashing a ferocious sprint down the front straight.
James Mortimer (Auckland) blitzed the field to win the men's 400m hurdles in 50.83sec, from Michael Cochrane (Canterbury) 52.06sec.
Iron man Brent Newdick (Auckland) competed in seven events and medalled in three. He won the 110m hurdles (14.71sec), pole vault (4.25m) and was second in the long jump (7.36m).
Andrea Koenen (Auckland) completed the sprint double when she won the women's 200m in 23.87sec from Louise Jones (Auckland) 24.36sec and Fiona Hely (Otago) 24.91sec.
She jumped the field around the bend, had a 2m lead coming into the straight and held on.
Alex Jordan (Tasman) completed the difficult 400m-200m men's double when he came with a rush down the straight to win the 200m yesterday, in 21.33sec, from Tim Jones (Canterbury) 21.63sec. He won the 400m on Saturday in 46.40sec, which was the third fastest time run by a New Zealander.
Commonwealth Games silver medallist Stuart Farquhar (Waikato-Bay of Plenty) won the men's javelin with a throw of 75.47m.
