I hear you! I bought an MG ZT-T 190+ from a guy in Germany. He said he was an MG enthusiast and only wanted to sell to another enthusiast. I bought the car. After I had the car for a few weeks all sorts of problems started to unveil which hadn't shown up during a very detailed inspection. I will spare you all the sordid details but let's just say that Bernd's mechanic abused the car in about every aspect you can think of. I have literally spend thousands of pounds getting the car in pristine state but problems kept popping up. I eventually decided to sell the car. I hope you will be spared that continuous misery and enjoy the car after you have fixed those minor details you are experiencing.
Note: the new owner is very happy with the car and hasn't had a lot of maintenance since he bought it. So I must have done something right