These guys look so similar to Sooty Shearwaters that I can't be 100% sure of this ID. But a local expert on seabirds told me this is indeed a Short-tailed.
Great work as usual Glenn! Pelagic BIF photography is tough but fun, this is very nice, perfect light angle! I photographed what the "expert" standing next to me said was a Short-tail on a pelagic out of Monterey, CA a couple months ago and I couldn't see the difference from the Sootys! I guess part of the ID is in the flight behavior, flap rate, speed, etc?
Awesome photo Glenn. Love the relative stillness of the water. Pelagics out here (Atlantic Ocean) are typically so choppy that it can really distract from the bird. I would expect a Sooty to have might brighter underwing color; apparently there is some overlap though.