Triple fi and jh16 are both poor for symphonic music due to poor coherency--each part of the orchestra sounds a bit artificially pasted in. Cymbal crashes don't sound real, either. That's actually the strength of dynamic driver iems, which often do timbre very well, as well as having excellent coherency. Timbre is how well an earphone can reproduce the subtle resonances that really make a violin or piano sound real.
The Future Sonics Atrio is quite nice, and the Sony EX1000 is another very nice choice. The eq-7 is nice, but lacking in bass for timpani, I found. Otherwise, it's a good choice.
I listen to mostly classical, from renaissance polyphony, to Bach, to classical composing period, to romantic and post-romantic. From string quartets to cantatas and opera to symphonies.
A good harpsichord sounds like a big harp, by the way. It's very nice. If it sounds weird and metallic, that's probably the issue. A lot of great harpsichords didn't survive and so recordings are done with little crappy ones. When you hear a nice one, you'll see the difference.