A follow-up to my original post. I didn't mention that I used pre-packaged supermarket pork, a product I've neither purchased nor used before. Some people have said that the quality of such products may be less than ideal. I didn't think anything about that when I made the purchase, as I just wanted some convenient pork.
I've since bought some pork from one of the two local butchers I use and the results were superior, much more in line with what I wanted and expected. From now on, I'll stick to my trusted butchers where I can get the cuts that I want ground, and packaged, to my specifications.