[Kevin Sevcik]

By my calculations, you can get just one cycle in and out at 60psi. The next one will be at greatly reduced pressure.
The Clippard tanks are 16 cu in each. That piston should take at most 14.1 cu in for an extend, and slightly less for a retract. thus, after one cycle, the air in the volume tanks will be at 60 psi, thanks to one of those nitfy gas laws whose name I can't remember. P1*V1=P2*V2. And I'm ignoring the volume of the tubes, as it is relatively negligible at this scale.

If you want to get all those shifts out of the 2 tanks, turn your regulator down to 40-45 psi. That should get you exactly that many shifts out of your piston.