Went back to some old locks. This is one of the oldest 5-pin ASSA locks I have. I can rake this consistently with a city rake, probably due to the very easy bitting, but I've had a lot of trouble SPPing it. Picked it today though!

Despite the wide open keyway and only standard pins, it's quite tricky; I think because of the very tight tolerances, so you end up playing this game:

My theory of why it's easier to rake is that, with a rake, I can set several pins at once, which works in this case. I have other similar locks with a much more challenging bitting (and keyway), where a rake doesn't work either...