Ideas for matching drives on a YY axis design?

Group:

Here is the basic design. Moving gantry table 72" X 80" (outside)
with twin ballscrew servo drives on the YY axis. Just got my Gecko
340's in yesterday and in reading the tuning instructions I started
to think about ways to "balance" the two YY drives. The servos have
500 count encoder as well as tach feedback.

What is the best way to setup the twin screws so they have the same
characteristics? I have lots of test equipment (300Mhz Tek Scope,
power supplies, scope current probe, function generator, etc). For
those of you that have used and setup the Gecko's feel free to throw
in your 2 cents!