Of the ones you mentioned, only the Tin T4 and T2 are reasonably close to a neutral sounding. The Moondrop Starfield is Harman tuned, which is well balanced. TFZ No.3 is a popular true bass head IEM. IT00, ZS10 Pro, ZSX are all bassy as well.
My recommendation for a well balanced sounding IEM for metal is the Jade Audio EA1 (which is the same as the FiiO FD1). It has a neutral-ish tuning with boosted bass, but not to bass head levels. For single DD IEMs, in general, I recommend beryllium coated drivers for metal, because you need fast, clean, textured, well defined bass, with good transient attack in order to keep up. None of the ones you mentioned, that I’ve heard (not the Starfield, H27, or se215), would I consider great for metal.
Other options include the KZ BA10. It’s bassy, but has BA bass, so it’s very fast, and different sounding. KZ DQ6 is quite good for metal, as I find the bass to be adequately fast and clean. The DQ6 is moderately bassy, but not as much as the other KZs you mentioned.
For a truly neutral sound, consider the Etymotic ER2 or ER3. I find both fast enough for metal.