Wow, thanks for noticing. I am *blush* flattered, and I did get a lot help from an awesome group of people in the community. Btw Syrius, we absolutely love people who use the search button, as I can see you have done. It is by far the most powerful tool on this forum. I wouldn't be surprised if our local hero, Searchbutton-Man, will be here soon and shower you with praise!
Yes, the circuit files are the Circuits\*.dat files. The numbers increase in accordance with the progession of the season, so S1CT01.DAT is Melbourne and S1CT17.DAT is Suzuka.
I used CMagic-4 (for Grand Prix 4) by Marc Aarts to extract the data. You get it in a format that can be viewed by Notepad. I am pretty sure that the patch didn't change the structure of the circuit files, so I think CMagic-4 will still work, but someone might pop in and correct me on this. You can find CMagic-4 in the editors/utils section of the downloads on the main site. It takes a while to figure out which numbers means what, but I am sure you will get the hang of it pretty fast. In any case, we are still here to help if you get stuck.
Regarding the telemetry bugs... Nah, they were improved but they were not fixed. Since the patch was made by someone else than the origianl crew, I think that they didn't totally understand the problem. However, I have found a workaround of sorts, so it is still possible get somewhat reasonable settings.
Generally, just follow that usual doctrine, on ride height, packers and so forth. That is, keep about 20mm more ride height at the rear, and set the ride height so that the plank grounds the second you are sure you will not need good mechanical grip anymore. Usually, it is at the exit point of the fastest corner, that is not totally governed by your aerodynamical grip.
Lets take Melbourne as an example. I think that somewhere between the and the Marina and fast corner called Lauda (just before the Clark Chicane) is an excellent choice for having the car hitting the packers. Then you will be on the packers for the straights, the car will leave them when you stop breaking for slower corners and you undercar downforce is pretty good for the fast Whiteford and for the Waite combination.
Identify a point like this for each track, and this is where you want the car to hit the packers. After you have made sure that you plank actually hits at this point, you just set the packers to be -3mm the ride height at the front and -6mm the ride height at the rear. Then test and see if you are bashing your plank to much to complete a race (just test for the longest stinit you have in your race strategy, and if the plank is at 0,4 or so you will be fine). If you are burning to much plank, then add 1mm to ride height and packers allround, until you can complete a race without going into the red. If you need something specific, then of course you can experiment a bit and/or go unsymmetrical. Its not as precise as we could do it in GP3, but it works pretty well.
It's only after we've lost everything, that we are free to do anything.