Weird. My 2013 XLT Ranger has some of the best headlights I've ever driven with on a factory setup. It's one of the reasons I haven't replaced the ute, as the later ones are (and this is the charitable description) total garbage.
I do run the foglights permanently on (I live on a rural road that very nearly always has foggy patches in the dips) but both low and high beams are absolutely fine. I'd suggest checking the headlight loom for voltage drop and then trying the upgraded Narva bulbs as the first steps.
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