Here's a really small tip on how I keep my paddle put.

Take a standard mouse pad and punch or drill holes in the
pad to correspond with the three feet of your [Bencher,
Brown Brothers, Vibroplex, etc.] paddle.  The paddle feet
are now touching the table top, so the height of the plastic
your fingers touch is correct.  Yet there is a giant surface
area of rubber designed not to slide holding the paddle in
place.

A perfect use for those mouse pads you get free at computer
conventions, or for only $1 or $2 at computer shows.
-- 
                      Fred Hopengarten K1VR
                   internet:  k1vr@k1vr.jjm.com