To lower or not to lower???

There are many paces that a squeek in the front can originate from. The upper bushings are not the first place I'd look. I'd check the LCA bushing first to be sure the pin is still reasonably centered in the rubber, and that the pin-tube welds are OK. If those are OK, then I'd pull the shock off and retest.
I suppose you could sound out all the likely places with a mechanic's stethoscope.