I bet if you unrolled a few meters, it’d be closer to 1.75. That’s the problem with variable filament diameter. You do the flow calibration and then the diameter changes and with that change, flow increases (if diameter increases) or decreases (if diameter decreases) and you never get good, constant flow. Which kind of looks like your print’s problem. 
For some reason, I thought the eddy current sensor and the servo extruder motor could account for this. Im probably wrong though. Maybe coming in a later update
In my opinion, when it comes to the H2D, they’re still way behind on the software side — as has always been the case with ALL Bambu machines. Just look at the X1C and the LIDAR, or the A1 series with its calibrations, etc. They’re behind in firmware, way behind in the slicer, print profiles, and especially in automatic calibrations.
The H2D tends to under-extrude, the cooling isn’t optimized (in the profiles), and even the bed leveling sometimes goes crazy — doing it three times per nozzle…
Let’s just say, as always, Bambu has exceptional hardware engineers, but the software side is handled by less competent people. That’s what I’ve thought for a while now, and facts keep confirming it. I just hope they fix things soon.