Since your bike has been in hibernation, you should check to see if Mice have chewed on the wiring.
It has been known to happen. Good luck.
I agree, those critters love to nest up in the tail section and chew those wires... had the same thing happen a couple years ago, they chewed the insulation of about 15 wires up there, including ones from the ecu, which I luckily saw prior to firing up the bike.
They also nest on top of the valve cover, and chew the wires around the throttlle position sensor... had to re insulate those also...
LED syßtems do require a bit of customization with the flasher thingy also, which you did, but if any connections on an led are compromised, it tends to make the working leds take up the slack in over voltage, which they do.
The popping fuse, combined with the readings seen on the vid, have me suggesting you disassemble the grip pod the turn signal and high bean switch live in, and check it out, blow it out well, and spray it down with contact cleaner and or wd40, and do some testing... popping the individual led lamps out and cleaning their bases, and the sockets wouldn't hurt also.
I have experienced issues on the early models with water in the switch area, combining the high and low beam headlights and also the signal lamps all simultaniously, which needed to be addressed ocasionally by the blow out and spray thing after riding in torrential rains, very possible water was in there and caused corrosion over time when it sat.