Breeder recs need to go private. I have a couple thoughts off hand but you are correct, breeding would be happening soon (Sept) as gestation is 63 days (9wks) for your preferred timeline to happen.
That all said, field lines usually belong to folks who enjoy hunting, so you will need to strike it lucky there to see if someone is giving up their fall/ winter hunting season to raise puppies.
I'll see if you are able to receive PMs but if not, contact me as there are a few field breeders in W. WA that do all the clearances etc. If they don't have litters planned, they may know of someone who does. The other thought I have is to get up to one of the hunt tests in Carnation WA this month (8/11-12, 8/25-26) and talk to folks there. Anne