Why? I like seeds.
Terry, tomato seeds are definitely a cause of bitterness in tomato products, but also impart a good deal of other flavors as well. I noticed that you said that you are using Stanislaus products, and those tomatoes have been bread and processed to produce a very low seed count. There are a number of tomato brands, both cheaper american brands and more expensive Italian imports that if not de seeded can have an overly bitter flavor that is distracting.... almost overpowering what we think of as the classic tomato flavor.