I'm going to do the same thing. What kind of tape did you use? Foam tape?
I went ahead and tried the tape also. I taped all of the areas shown in the above post. I used two kinds, 3M mounting tape and 3M thin butyl tape. I also put a small piece of tape inside those little springs that buzz. While it is quieter, what I think makes a difference is the position of the belt tensioner. For whatever reason the middle position is best. All the way up or all the way down seems to telegraph vibrations up into the plastic pieces of the headliner and causes those to buzz. I'm willing to bet on a rough road everything in this car will rattle. And you can chase these noises probably forever. At some point I guess you just have to quit and say it's acceptable.A kind of 1mm thick foam tape. I dont know whats called. I think the most important thing is the tape is a bit thick.