It sounds like you need to change the pin connection from the SSC-32 to the servos. It should not be going sideways.
From the manual:
XL50XR100XS100”
Causesthegradualleftturnat100%speed(andstartsthesequencerifitisnotalready
started).
“XL-100XR100XS50”
Causesaleftrotateinplaceat50%speed.
This was expected… On the empty CD holder it was hard to see that it was a gradual turn, I thought it was walking sideways. At any rate, it was doing exactly what I expected… for once.