Wow, nice information Owen. And indeed a difficult object. I add my observations with the extra information about the observing place.
4" Bino, 23x, fst 6m5+ (Sudelfeld, Pre-Alps, 1300m)
not visible or suspected even under good transparency
16", 51x, fst 6m5+ (Stumpertenrodt, low-mountain-range, 420m)
first try together with Martin Schoenball, we both see somewhat faint but in wrong position, negative observation
16", 69x, fst 6m5+, (Sudelfeld, Pre-Alps, 1300m)
under good sky the best view with 5,8mm AP; also with max. AP (7,8mm), not successful with 4mm AP; stands between one 9mag and one 11mag star; visually as a round, 6' large, very faint spot of light; 3-4 stars glimpsed out between the GC, can hold GC with averted vision
16", 51x, fst 7m0, Bieler Höhe, Alps, 2000m
finally, seen under very good sky conditions; nevertheless extremely difficulty to detect; only with max. AP, large, circular wisp of light NW a mag 9 field star
27", 113x-293x, fst 6m5+, (Sudelfeld, Pre-Alps, 1300m)
easy visible with averted vision and 113x, borders of GC clearly detectable, somewhat mottled structure within the GC; with 172x more mottling and similar visibility of the borders; from 293x up several stars within the GC, the GC itself disappears
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