I'm confused. Maybe you can clarify this.
You said this measurement was based on microphones in your ears. Are the microphones at the entrance of the ear canal (ie blocked meatus) or probe mics at your ear drums (DRP or ear drum reference point)
If they are blocked meatus measurements which they appear to be then you are not including the 3 kHz ear canal resonance.
The Harman Target Curve is measured at the end of the ear canal and includes the 3 khz resonance. So have you accounted for that when equalizing to the Harman Target? If you are equalizing a blocked meatus measurement to a curve based on a DRP that would explain why it sounds bad. Just checking.
My measurements with in-ear mics were blocked-meatus. But the Harman target corrections I tested against were using EQ settings reported by others, from Oratory1990 to now, Amir. The corrections that sound best to me are measured with in-ear mics with a mostly flat response up to about 4kHz, or about as far as I trust my measurements to be consistent, and an elevated bass shelf of about 2-3dB.
The EQ settings to Harman target as reported by others sound too bright and too bass-shy to me (possibly the same thing). The goal for me was to find what sounds good to me, it wasn't a research into a "better" curve. My assumption was that there may be sufficient variations between my ears and others that it would be worth the effort to try to find what works best for me, and so far, it's not what others seem to prefer.