HI! I used to live in Paso about 14 years ago- my daughter was born in San Luis! Still have alot of family out there in Atacadero. Creston is so nice since there are still so many wide open spaces. But that does lead to predators....
Another thing that can help is to put a radio out by the coop set to a talk show- it seems to deter the coyotes around here. I also have electric fencing, but sometimes it isnt turned on and the radio is my back up. So far it works but I dont count on it all the time. Electric fencing is a very good idea and, no, it wont hurt your chickens. It just kinda zaps intruders so they tend to stay away. But one thing I have learned, make sure it is tall enough or experienced predators will jump over it, and so will your chickens if it is your only fencing. We have fencing and then put the electric fencing up too.
The flour on a bait board sounds like a cool idea, my worry would be purposely attracting predators and letting them know chickens are there sooner than needed. If youre in Creston, you WILL have predators, if you want to know what kinds, just call your local animal control center. I do know there are possums, racoons, skunks, all sorts of vermin, hawks, and coyotes. Im not sure about wolves, I think they have been wiped out in that area, but animal control would know better than me. One thing about that area is alot of people have already used electric fencing, so many of the predators are already familiar with it and will stay away if they sense it.