Sounds to me like the whale you saw that jumped and had a 2' dorsal fin may very well have been a False Killer Whale. All whales, dolphins and porpoises have a horizontal tail flipper. Only fish have a vertically oriented tail flipper.
As for the 5-6' animals with hardly any dorsal fin, I'd say those were most likely Dall's porpoise. They are probably the most common cetacean in Puget Sound and are known to bow ride. You can easily identify them from a distance because when they come to the surface there will usually be a rooster tail of water. The only other species that size could possibly be a Harbor Porpoise. But, they are smaller (4-5') and very subtle and difficult to spot.
Both Dall's and Harbor porpoise have a triangular shaped and small dorsal fin ... not curved like a dolphin.
Basically, if you are out in Puget Sound, you have four choices when it comes to whales/dolphins. Killer Whales/Orca, Dall's Porpoise (think baby orca and rooster tail), Harbor porpoise (small, grey color and very subtle) and grey whales.
A place to check on the web for cetacean sightings is
www.orcanetwork.org. The focus is mostly killer whale sightings, but they do a pretty good job of tracking other sightings in Puget Sound.
Cheers and good luck fishing