Notice of your reply went to my spam folder - sorry.
The big center nut gets 59 ft*lbs, and the four little ones that hold everything to the strut tower get 26 ft*lbs. That's from my 2008 factory shop manual, your car should have the same or very similar specs.
Norm, the 4 strut tower nuts have been torqued correctly. I continued to tighten the center nut with minimal resistance until it appeared it was fully threaded down.
With that said, no change in condition. Not only is this sound loud and uncomfortable, it can be heard driving from the outside. People walking and cars next to me have been turning their heads staring as I drive by, so I'm thinking this condition may be serious.
I went through everything for the most part. New struts, new endlinks [tightened well], new sway bar bushings [no real play aside from the minimal gap that you said shouldn't cause an issue], new LCAs, new strut mounts.
I did read, that it may be the strut mount "bearing."
I had swapped the strut mounts with AM's OPR strut mounts, which required that I reuse the factory OEM rubber/plastic bearing from the stock mount. Do you think this rubber bearing is causing this problem? I'm now highly debating buying the GT500 mounts which should replace the strut mount and bearing completely.
THe entire front suspension just feels so unstable. And it feels like it's lower in the suspension. It feels as if almost the LCA is not bolted in completely, and is banging up and down. I definitely hear and feel something metal on metal clunking, squealing, etc. I'm borderline skeptical at this point. To me, it doesn't seem practical that a strut mount could cause the issue down lower, as it almost feels like someone is banging some thing else in the passenger footwell.