Why did they replace the front tire? Did they actually measure/inspect it and find a defect, or did they just replace it because you mentioned another member here posted that his handling issue was fixed when he had a new front tire installed? I'm thinking it was the latter, and if so this just shows that guesswork based on something you heard or read is rarely a good substitute for proper diagnostics. Based on your posts it appears something changed basically overnight, versus a gradual change over an extended period of time. Something obviously failed, and it's going to take some real diagnostics to find that something. Just swapping out parts until you stumble on the answer could get very expensive, and the ESP isn't going to pay for it. Find someone really good at diagnostics and willing to put in the time and effort to check the things that could create this problem. Better to pay a bit more for good diagnostics than to pay much more just changing parts and hoping to acidently fix it.
Jerry