RPM SETTINGS?

[2010RAMRT]

U7137X
v.9r08
2010 RAM RT

I'm trying to set rev limiter and shift points but I found out the hard way that you have to set rev limiter AND shift points at the same time or else your transmission will do a sort of "double clutch" when it shifts.

I notice that when I try to set the shift points the menu gives you options based on absolute RPM, E.G.: 5000-6200.

But when you try to set the rev limiter you are only given a range of -600 to +600.

What does this setting mean?
+/- 600 RPM from what?
What is the factory setting supposed to be?
What is the predator setting?
Do the tunes affect factory limits?
If so, what are the "tune" settings?
What are some good settings for a 2010 HEMI?