Good, clear photos, spawn. Very helpful. I'd agree that the twist pitch is very near 1mm.
For two strands of 30 gauge, with a 1mm twist pitch per coil - at 1.6Ω per coil for a net resistance of 0.8Ω, at 30 watts, I come up with a HF of 334 mW/mm²... pretty warm, although not excessively so...