Sounds good!
Yeah, the dimmer limits it to 100% if its a 100k poti. Only A version has build in regulators for voltage and current. With the B version(< or =54v) its running in constant current mode anyway and compensates wire losses automaticly. Thats probably the 0,1v you are above 54v...
I've done the same and switched to a remotely wired HLG-320H-C1750B driver just because heat is one limiting factor in my setup and each HLG-320 produce already ~20w of pure heat at 100%(5-6%).
Better to keep that heat out of the tent if you don't need it.
One could also reuse the heat and heat up the incomming air or the grow table in winter.
Remote wiring has a few good benefits.
I realy like this cheap low reststance "Aviation Connectors" from e3ay.. 1,15$! They are available with 2-16 pins and in different layouts. These are for connecting the wires to an external driver housing(3 pin for powercord and 2 pin for the dc connection) but you can get them also to connect just two powercords or 2 DC outputs.
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