I think it looks very fishy out West of the bank, however I haven't been out there as of late, and not much overall. I am very surprised the Blue Dot did not produce very many fish for you, usually it is a sure bet this time of year. For numbers, the offshore banks are usually the best bet. For bigger ones, you are allways going to be better off anchoring up on the inshore pinnacles (in my opinion).
If I had some guys come down to the dock, and whip out my guide fee to wave in front of me and say they wanted to hold out for a bigger fish (Not a quick boatload of tennis rackets), I can assure you I would not be anywhere NEAR Swiftsure. I would suggest that they either come back in April, or that we would hook up on some of the pinnacles close to shore and do a lot (and I mean a LOT) of waiting, with great BIG bait that the dogfish can't get their mouths around.
Horse herring gets shredded this time of year, all I can say is I hope you saved your smaller coho and sockeye heads, something about the size of a softball. You can watch the doggies mouth it on your rod, but when it is on a 20/0 hook, I don't know of a lot of doggies that can actually get it in their mouth. They can chew on a head for an hour and it will still be plenty intact to catch a slug, and the action of the dogfish knawing away on it should distribute the scent downstream even more.
No joke here, I am not trying to keep boats away from the bank, I just have historicly caught bigger fish on the smaller pinnacles in the spring. I have hit the odd big one, maybe one out of 50 is over 60 lbs for me on Swiftsure, but for the most part is is just a great way to get lots of fish in the boat quickly.
There is no reason that the butts shouldn't be in the deeper water at all. Longliners often get them deeper then 500 feet, and look at 5Salt's luck as of late. I was going to drop my lines on a few DEEP humps I have found today (400ft and deeper), but my real job came a calling so I am sitting at a desk right now
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Bottom line, in my somewhat educated opinion, throwing hardware out and drifting the offshore banks makes numbers, not size.