If you bring a wire from the HIGH beam bulb feed to the switching terminal of your relay, when you switch to low beam the relay will switch off. (Unless the AT headlights are some overcomplicated system of which I, a luddite, am unaware! Canbus or something?? Not that I really know what it means!) Put a switch in that line as well so you can isolate the aux lamps from the high beam if you want.
You can see the cutoff beam pattern of the wide cornering Squadron in my middle picture. The bottom picture is the pattern with the driving combo, which is part wide angle and part spotlight. If you have 2 Squadron Pro driving combo lamps, you won't need the high beam - you will barely notice it is on!
A dimmer is not necessary for use alongside the main beam.
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