C4? Are you sure you're talking about the Bering Straights? I think I was class A2 but without the pins (i.e., C2).
I do agree with you about Central Latitudes, although when I did it in the mid '90s there were only a couple of fixed rurps so I had to place about 3 or 4 of my own. Made the hook moves at the end of that section way more interesting.
Sorry, I had a total brain fart. For reasons I can't explain, I confused the Central Latitudes with the Bering Straights. Your caption clearly says Central Latitudes so I don't know what I was thinking. Too many nautical references I guess.