Aww man, I'm sorry it took so long for me to see this.
That's a username I haven't seen in a long time! Hope things are good, and glad to see you here.
I suspect you have already made a decision but just in case, the info you want is below
Instructions for adusting the Z2 can be found here http://inceptionforums.com/showthrea...ull=1#post8341
For the Prophecy the magnets and clutch are really there to reduce the shockload when the stack stops and the drive is still running. The board monitors for the increase in load on the motor as the drive starts being resisted. This is set electronically. The shockload (often more important) is reduced by removing magnets so the clutch can move more easily when it goes from spinning quickly to the drive stopping. It may only slip a fraction but it's enough to save a paintball.
Yes Stack Tension Monitoring measure the load and current through the motor so it can tell when it's stalled and control the power to it during that time and the point at which the power is shut off.
You can dial back the Z2/Prophecy as far as you want. The new Z2 shouldn't need any adjustments out of the box, as it is intelligent and self tunes, but if you want to adjust the levels to which it sets itself for the instructions are in the link I posted above.