I’d push up the budget and find a used pair of the JVC HA-FD01. Hands down some of the best detail I’ve heard from a single dynamic driver under $300. Can get a bit fatiguing in the treble region, but there is a mod that you can perform to fix this issue (JVC HA-FD01 Dynamic IEMs). There are used pairs on Amazon for $235; if you can find the Drop version (HA-FDX1), those come with filters with the mod.
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