Systemdek IIX

Level issue
When I level the table I find it's hard to get the platter exact.

The platter is glass and has soft rubber (?) mat.

When I level by making the platter depth to table .5mm all the way
around the bubble is half in/out of the circle where the stylus lands.

What I can do is set it so the area where the stylus lands is level
- but the bubble is off at the opposite end. How should I leave it?

Anti-skate issue

Using the HFN test record i get excellent results using the 15db
tracks (not the 16db - but I hear most people don't?)

When I use the anti-skate (I think it's a Jelco arm) it doesn't seem
to do much unless I am at the extremes. (The 15db track tells me this
- buzzing). my thought was that the adjustment is crude and I am good
to go? Is there something I am missing?