There's either a recall or technical service bulletin for the 2010-2011 Prius headlight wiring harnesses, and yes, Toyota's fix is to add length to the wiring. 2012-2015 aren't affected.
2010-2015 Priuses weren't available with HID headlights, only halogen (trims 1-4) and LED (5). The HID issue was with an earlier generation, 2004-2009.
Angel, try the simplest fixes first before you go worrying about expensive modifications like suspension bushings (which, for the record, there aren't any other than OEM-spec available). Try different bulbs first, make sure it's had the headlight recall performed, and report back. It is almost certainly not your tire pressure at fault here.
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