Giovanni Adamoli, from the WinJupos project who analyses my Jupiter images, also confirmed the albedo features on Mercury.
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As regards your March 4th Mercury image, I can positively confirm you registered a known dark equatorial streak, reported in albedo maps (such as attached Graham’s). It is a junction between so called “Solitudo Neptuni” (left) and “Solitudo Poenicis”, running about 10°N between L = 160°-220°. Coordinates of Mercury’s disk centre at your observation’s time were about L = 162°, latit. = 7°S.
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It's given me a renewed interest in imaging Mercury, and getting an IR-pass fitler, but the problem at the moment, is that Jupiter is there.
When the seeing is good, it takes a strong will to slew away from a 45+deg Jupiter, to a <20deg mercury..
This morning I just didn't have it in me