Why don't teal like south central/ southeast LA marsh?

Can anyone give me some kind of explanation to this? On my lease in Dularge we have phenomenal big duck seasons (all we shoot is gray ducks and greenwings but i'll take whatever I can get) but as far as teal season we never have jack sh$t, while southwest LA seems to always be loaded down with birds this time of year, it seems like the only place those blue rockets like down this-a-way is Venice. Does anyone have any thoughts as to why those birds just don't come to us in September? Marsh looks great, weather is still too hot, but rode the entire area saturday and may have seen 40-50 birds. not enough to even think about hunting, and thats every year