Yes, thanks very much for the tips OldStoveGuy! They definitely helped.
One thing I noticed was that I couldn't quite get the oven burner to light properly every time. Even after I cleaned out the oven burner, it'll light on the first side by the pilot fine, but it takes 30 seconds to a minute to climb over to the front then other side. In that time, you can smell the raw LP.
I not only used the BB's to clean this burner, I cleaned every port with a paper clip and a pipe cleaner, including the climber ports between sides. Then I degreased the outside of it with Simple Green, washed it off inside & out with dish soap & water, then ran it straight out to the air compressor and blew it out until it was all dry and clean. When it's lit, it burns clean with a mostly blue flame. Hardly any yellow tipping, not lazy.
Any more tips on this?
My experience with modern burners is there's usually some dirt or soot causing this, and cleaning the burner usually fixes it. This cast iron burner may be different.