[hannes69]

If using reclock, there is no need to create a custom res in order to try and compensate A&V clocks deviation, because reclock is realtime synching the video to the audio, and therefore will procure a perfect A/V synchronisation.
Am I right?

Yes. Reclock is TOUCHING the audio so you have perfect sync and so no dropped or repeated frames.
If you have problems with Reclock, don´t like it or you don´t want to TOUCH the audio, you can do what is described here. With the method described here you don´t manipulate on video or audio, you are using a "trick" instead (that is a little bit complicated by it´s nature) which doesn´t influence the base materials video and audio but plays with timings.
To explain it short: The trick works with the fact, that during video presenting there are not only the pixels we actually see but there are in addition "black" pixels outside the shown range (after each line and after each whole frame). We can force to show more or less of these black pixels (which takes more or less time) to manipulate the refresh rate to compensate the video/audio mismatch (=clock deviation). If there wouldn´t exist these black pixels, the trick couldn´t be done.

As I mentioned earlier, the a/v sync problem exists on every computer and there are 3 possible solutions to work around that:
- reclock (manipulating audio)
- madvr smoothmotion (manipulating video)
- custom resolutions (the method described here using black pixels)

The 3 solutions each has it´s own advantages and disadvantages. It´s up to you to choose. The method described here is the "cleanest" but it is more complex to achieve than the other two...