If you want a shot at bigger coho, the KP nor Sitka are not the places to do it. Perhaps look at something out of Cordova, it's one of the few places that will offer you a shot at the bigger coho like you see down south ... most coho fisheries up here are for smaller, but better fighting fish than you'd see for example on the OP.

There should be some charter boats there as well that will run out to around Montague Island or other areas for some halibut fishing.

Have fun!