miners lettuce seems to like acidic soil where I live. also huckleberries, thimbleberries (my favorite berry), raspberries and black berries and probably all the other cane berries. I live in a pine forest and so far all the plants I have grown have been happy with the acidic soil but it seems like it naturally wants to be a berry and pine tree forest.
I'm also looking for things to go in the blueberry clumps on the south side of my old field mosaic. I'm hoping they'll play well with haskaps, lignon berry, high bush cranberry, ground cover roses... Or is it ill advised to mix bloobs with so many other shrubs?
Northern New England forests are notorious for acidic soil and blueberries. You might find some benefit from looking at a species lists from plant communities in that area. Natural Communities of New Hampshire might be a good place to start.
FYI, Silver Maple tends to be a flood plain species.