The issue may be the Smart Switch, it's connectors, or the hi-lo switch. Not the fusing - the same fuse feeds the low beam so it's good. The wiring diagram in the 97-8 std/tourer indicates there are no multiple pin connectors between the sw and the headlight. So the only ones will be the SS connections you added, and the connection at the handlebar switch. Fairly easy to find with a test light probe or a meter. Start at the hi-lo sw or the wires from it. The hi beam wire is blue, while the power feed to the sw is bl-wh and the low beam is white.
The Smart Switch has 2 relays in it, one ea for the low & high beams. Some have had failures with the discontinued SS. It can be replaced with my original circuit of the same function, that employs simple automotive relays available anywhere. I have installed this circuit in all 3 of my Valks, and the Magna. FYI I have about 23 of those relays for many different functions on my highly-modded "Jade". In the 7 years since I set up almost all those relays in 2015, I have had ONE fail. And was easily replaced by a std relay from Autozone. Now I keep a stock of them in my electrical kit. BTW, have almost as many relays on Deerslayer. None have failed since 97.
This circuit is easy to set up in an afternoon. Just get two $11, 4 or 5 pin relays (don't need the fancy dual one I mention in the writeup). You'll need some spade connectors, a ring connector, a fuse holder, wire and wire shrink tubes. Maybe electrical tape, I like wire ties and looms to neaten things up. I solder everything so it never fails.
http://www.horseapple.com/Valkyrie/Tech_Tips/Headlight_Upgrade/headlight_upgrade.html 
