Thanks Mike, I've adjusted a little bit screws from bottom and mount works better now, I don't need to lock azimuth to max if I want to use slow motion.
But...
I had more time yesterday and I've decided to took apart it. I've noticed that worms in altitude behave in different way, even if this is the same construction. I mean, I see that azimuth worm turns with the axis when you pull azimuth manually.
And when you pull manually altitude, then worm doesn't turn, it is always in the same position.
So in my opinion you need to adjust worm inside azimuth mount.
This part:
It should be in the same position when you turn azimith. Then slow motions will be working always.
Azimuth slow motion should work in the same way as altitude - no difference if you loosen or tighteen clutch (in my opinion this is just brake like in az4, not clutch ).
I saw some videos of this mount, and slow motion in azimuth works whenever you use brake or not.
So as you said, I need to adjust everything and add more grease. I will get back when I finish