By SCzEngrgGroup's recommendation I tried to get the one I made up to about 3000 pounds. It IS one of the hydraulically multiplied variety though.
Here's one of my first tests (note the face shield)...
https://www.youtube.com/watch?v=4zXj7LT5Q6g

I'm pretty sure these are what I used most recently...
McMaster-Carr

0.075" sounds like a good number to shoot for. I shot for 0.050", but sometimes it was inadequate.

The thing about a 6-1/2" piston for Torus Pro owners is that there is not enough room to fit a 6-1/2" piston above the spindle. I'm not sure for what machine you have though.

I did get pullout on occasion, only when there was significant chatter and then only sometimes.