I probably figured out my problem with noise going form timing belt area after the timing belt change. I was not alone with this problem, more people have these problems.

I knew (and many people told this to me) that when I loose my timing belt, the noise stops, but I was worried about vibrations that the belt made when the engine was running. Today, I made some videos with my and my friend's lude to ask you about it.

Here are the vids:

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Original state, with the tensioner set according to the Helms, the noise is still present:
engine running - no vibrations
belt slack with piston #1 at TDC - looks pretty tight

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Loosened belt, so the noise has gone:
engine running - the noise has gone, but notice the vibrations at some engine speed. Is this ok?
belt slack with piston #1 at TDC - looks unchanged
maximum belt slack - I tried to rotate the crank and find the position with maximum slack - here it is. Looks loose.

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I was really confused, so I called my friend with the same lude (H22 4G), but still with the auto tensioner, so the results should be the right ones.
engine running - the vibrations look exactly the same as mine
belt slack with piston #1 at TDC - looks same as mine.
maximum belt slack - again same as mine.

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So, I hope the vibrations are OK, what do you think? Can I drive with this belt slack and vibrations? Or is this slack not normal?