Despite heavy rain dogging much of the championships week, about 1000 runs had been completed by the end of the fourth day, chasing the North Island titles.
The top seven in each class then face runoffs for the New Zealand titles, the first expected to be the two hunts today, followed by the heading finals on Saturday.
One trialist said much of the better form reflected finer conditions and the leaderboards, updated at least twice a day, had changed regularly.
There were 10 changes across the class leaderboards yesterday and among the departures was the new South Island zig-zag champion, Steve Kerr, from Mackenzie, in the South Island.
Southern Hawke's Bay South Island champions Sam Magee and Bernard Arends were also missing.
Leaderboards at 4 pm on Thursday:
Long head: Graeme Cook, Glen (Whatatutu); David Sheild, Jack (Dannevirke); Howard Ingles, Lou (Waimarama); Stuart Child, Brodie (Te Anga); Merv Utting, Bob (Poverty Bay); Graham Wellington, Rachel (Aria), Donald Fannin, Sam (Moawhango).
Short head and yard: Lawrence Rau, Dixie (Matawai); Kevin O'Connor, Jax (Waikoau); Neil Evans, Tess (Omihi); Neville Child, Finn (Maungakaramea); Guy Peacock, Slim (Makotuku); Gavin Drake, Baldy (Mataroa); Eion Herbert, Bell (Tapawera).
Zig zag hunt: Liam Park, Risk (Moawhango); Greg Anderson, Gus (Te Anga); Bennett Manson, Sam (Mohaka); Leo Edginton, Deano (Tolaga Bay); Tom Manson, Buck (Mohaka); Fergus McLean, Suzie (Omihi); George Shield, Smoke (Tolaga Bay).
Straight hunt: Steve Kerr, Rich (Mackenzie); Troy MacDonald, Mouse (Putaruru); Ned George, Kruger (Wairoa); Tom Manson, Buck (Mohaka); David Scragg, Flow (Wairoa); Dylan Gallien, Troop (Mataroa); James Maher, Rogue (Moawhango).