Pam between each ?

I think you have to gauge that for yourself as you see how each batch is browning. Usually the first batch is different from the rest, but, again, it depends on how you like your items to brown as well as how much added oil or shortening you like.

I think this is going to depend on the type of pan you are using. Also the recipe. I make waffles and never spray my iron but also it doesn't wash. My griddle I spray before each use. My new fry pans said to season with oil when I used them the first time and to NEVER spray with the Pam. I never have used the Pam in them and have had no problems with them. So I think this is going to depend on each food, what is in it and the type of pan you are cooking on.

I think it really depends on the pancake recipe. I have certainly resorted to oiling the pan after each batch sometimes, because the pancake were sticking to the pan so badly if I didn't. Maybe if you add a couple tablespoons of oil to the batter right before you spoon it into the pan and not mix in it fully, it will help.

bread products are soft that means they have a great sponge like effect unlike other foods like eggs. that means whatever you cook them in they will soak up, and if you want all of them to turn out the same you should spray down te pan before each one. i recommend using an electric griddle. they heat up evenly and you can cook more on it at once so it uses less oils to cook.