Funny, I think the strangest thing about Ironclads/Battleships is how rarely they were used. The list you gave is pretty much all engagements:
Out of my head:
- Hampton Roads 1861
- Huascar vs the rest of the world
1875 (I think)
- Port Arthur/Yellow Sea/Tsushima 1904/05
- Doggerbank/Skagerrak/Moon Sound and a few inconclusive and almost-battles
- Renown vs Scharnhorst/Gneisenau 1940
- Scharnhorst/Gneisenau vs various Battleships on their north atlantic raid (almost battles)
- Punta Stilo 1940
- Denmark Straits/Final Battle of Bismarck
- Guadalcanal 14th November 1942
- "Battle of the Blips" Attu 1943 (only one side shot at nothing, but Battleships did shoot a lot there)
- Battle of North Cape
- Surigao Straights
Maybe I forgot one or two, but those were basically ALL engagements by first class steam driven armoured warships ever.
Strange, if you consider that the number of sailing ship engagements was much higher in the various wars of the 18th century allone.
Maybe those ships were just too expensive.