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That's the sucky part about Diablo and why I got rid of it for a Superchips... Diablo doesn't provide Partial downshifts, only Superchips does. To me, that's only half the tune because I only care about transmission control and care less about any kind of HP/TQ gain.
Other than that, they do the same thing.
Which predator do you have? Mine allows for full throttle upshifts. As far as the rev limiter, set it to 6000 and set shift points to 5800. I think mine is a U7137, or something like that, and works for hemis from 2003 to 2008. And for the guy that says the superchips does the same things a diablo will do, go try to write a custom tune on your superchips and see what happens