Hi Sean, I've experienced something similar to what you have explained and if you have not sorted the problem already I hope it'll help that I mention that I had a camber issue on my front wheels and had it straightened up at precision wheel alignment down in CPT, During the suspension check I also found that the shocks were done for so opted for the the Burly Pro set (which is quite new on our market) and got new shock stabilizer links and just replaced the engine mountings too.
My RunX is on 307xxxkms.
Some of the common symptoms of a bad sway bar bushing or sway bar links going bad are:
knocking uneven noise road,
lack of stability when driving and noise going over speed bumps.
poor handling during turns.
I'm happy to say that all those funny noises and vibrations are a thing of the past, and seeing you've got a 2004 model I can only imagine your car being close to or just over the 300 000 kms mark as well.
Once again hope my 2c is insightful. Let us know if you managed to sort it out.