I have a Unihydro and a Piranha. I use the brake on the Unihydro. I ended up mounting a 2" travel dial indicator on it so I can accurately repeat bends. My process (for better or worse) is to bend in the ballpark and note the indicator position. Repeat until the desired angle is produced. It usually takes me 2-3 bends to get my bend "dialed in". From there, I just bend to the same reading on the dial indicator. It's pretty crude, and a bit wasteful, but works for my limited bending needs. When I have lots of bends, I farm it out to PM members with proper brakes.
I only use the stroke adjustment to set the return height of the punch to a little above the punch stripper. It's not very repeatable on either machine.