My choice for best alrounder is Hare & Copper nymph, either Beadhead or plain.
Although I live in New Zealand, our stream insect life is very similar to yours. (Caddis, Mayfly, Stonefly etc.)
Not all Trout are selective feeders. Open them up and you'll sometimes find a wide variety of feed.
Often they'll have a go at something that bears no resemblence to any natural feed source.
Try experimenting with different colours.
And remember don't give up on a fish, if he isn't spooked, and is actively feeding, keep trying different patterns.