.. Some juice getting to the low beam element still, nothing to the high beam. Does that make sense at all?
OK so it seems your earlier prognosis was correct in that the bulbs were probably OK too
The contradictory piece of data is that the Hi Beam Indicator lamp is coming on - that is fed after the Hi/Lo switch and after the Left Bar Switch to Main harness connector set which, as previously mentioned rules out the switch and the connector to it.
So something has to be compromised in the wiring from stock - again, the ground is common for both hi & low beams so its not that either.
That says that there is a 'break' on the high beam signal wire between where it leaves the right switch connector and the Connectors (two!) for the left and right lamps.
It really would make sense if there is a headlight relay kit, or some other wiring mod for the headlights.
The two intermediate connectors, the ones that feed the headlight sub-harnesses are under the tank, just behind the steering head on the right side
Check the sub-harnesses from there to the headlights themselves (going into the buckets) and also the wiring to those two connectors (which comes from the Left Bar Switch connector
Look for some DIY mod there .........
The wires on the main harness side of those connectors you are interest in, are the Blue/White on each connector (the Blue/Red is the Low Beam)
Those two Blue/White wires (one from each connector) are spliced, together with another Blue/White which feeds the Instrument connector, originating from the Left Bar Switch connector.
If you cannot see anything obvious at the exposed wiring close to the 4-way connectors then you may have to open up the harness to find the splice and look for possible compromise of the splice joint.