Tonearms with no anti-skate adjustment

I was very proud about myself when I got 90 microns ''pure'' from

my combo Sumiko 800 + Ortofon MC 30. But then I have read

Van den Hul's warning not to use too much anti-skate needed for

such values. Too much anti-skate was worse according to him

then no-skate at all. By all his carts one get anti-skate values for

 his sample.

The other problem is that this ''force'' also depends from record

radius. So, obviously, the same anti-skate for the whole record

is also problematic. I ever owned the only tonearm with ''variable''

anti-skate  : Sony 237 with an ingenious ''curved'' lever with

different anti-skate related to record radius. In addition there

was provision for stylus shape. I give up anti-skate not because

I don't believe the theory but because there is no way to do this

correct.

That is mistaken. Anti-skate is used to compensate for a force that an offset pickup arm exerts that gives it a tendency to "skate" towards the spindle.  

" that gives it a tendency to "skate" towards the spindle"

Unipivots are generally designed to be as stable as that configuration permits. This means that ”lowering the tail end” increases downforce not decreases it as you have suggested.