Viper comes stock with adjustable control (transfer) rods, although they do not adjust as far as some of the aftermarket ones do. I feel that Yamaha did this to limit the potential of damaging other components.
The total gap (top and bottom) at the control rods is the amount of "uncoupled" travel allowed. Uncoupled travel is where either the front or the back of the skid can move independently of the other.
Focusing solely on weight transfer . . .
With the sled seat weighted down with normal driving weight, more gap on top allows for more weight transfer under acceleration and more gap on bottom allows the front to lift more before starting to transfer weight. Under acceleration, the gap should be first all on top, and then switch immediately to the bottom as soon as weight transfer occurs.
The limiter straps are just that, they put a hard limit on how far the front of the skid is allowed to drop, and thus how far the skis will lift under acceleration. Adjusted too loose, and the skis will lift too much and you will go slower, adjusted too tight they will hinder weight transfer altogether, and you will also go slower.
Start with a conservative setting as mentioned above, and then test, make a single change, test, repeat until you get the feel of it. While I have learned to only make one change at a time, I have also learned that it usually takes a couple changes together to get the desired effect. The test in the middle just helps me "feel" what that one change does. What I am trying to say, is that in making just the one change, it may not give the desired effect until the other changes are also made, but if I make them all at once I have no idea what is happening individually when it doesn't work.