Goldfinch and Dennison were 10th and 12th respectively.
Walker was able to make back some ground when he flipped the finishing order to beat Newton to the line in Sunday afternoon's Race 3, while Paeroa's Blake Ross was third.
Goldfinch got up to eighth while Dennision was 11th.
Timaru's Harry Parker was expected to have a good weekend, but settled for finishes of fifth, sixth and seventh in the three races.
Newton's two victories with one runnerup spot moved him slightly ahead of Newton with one win and two runnerups, although the final points tally will be adjusted after the seven round series as riders will drop their worst result.
The next round is at Hampton Downs Motorsport Park on March 3-4, with the competition wrapping up at Taupo's Bruce McLaren Motorsport Park on March 17-18.