OK..... here is the fix. from a fluid power systems engineer (me)
only use 1 cylinder on the servo end - not two.
bleed both cylinders very well. submerge the bare cylinders in a bowl of oil, reach in and stroke them till no air comes out.
before you pull them from the oil bowl... retract one cylinder completely - and extend one cylinder completely.
leave the cylinders positioned this way. take great pains to not compress or extend them.
(you can use vegtable oil if you want.)
install the master and slave cylinders on the servo and gear leg.
bleed your lines the same way in a bowl, and fish them thru the leg, and hook them up.
VERY IMPORTANT... hook 1 line from the rod side of the master to the rod side of the slave. and from the blind side of the master to the blind side of the slave.
clean up oil , and enjoy.
when you now center the master, the slave will center, and so on.