Paul, what is the largest hosta you have. Sum and Substance perhaps. Or Jurrasic? I have a west facing bed that is in shade til 3 in the afternoon then one side gets sun, then the other side does. Well, I is between the house and fence with a 30" bed on one side (10 feet long) and 24 to 40" wide on the other about 20' long, so the sun switches from one side to the other as it progresses to sundown. I have bleeding heart against the house which will bend and cover half the larger width bed despite restraining cages. I want to fill in the rest with something. Hosta and astilbe are good candidates. Thinking columbine but they like more sun that I think this spot will get. Soil stays fairly moist all the time. The narrower side has moss type problems with astilbe, solomon seal, japanese iris, leopard's bane. All do well. Plus two huechera - a little iffy there due to moisture content on that side. I can go a zone 4 easily or have even pushed 5 but rarely. Has to be just the right spot.
