If you want to experiment, try opening the library panel in the HUD. Switch to the presets window. Then click in the layer field and select edit preset. This will launch the preset window where you can scroll down to select the mix number you want to edit. Grab the parameter for offset and drag it with your mouse. You will get real time feedback that you can view to adjust and test your offsets. You can do the same with the edge blending feature as well. Once you have the adjustments the way you want them, save the preset and then you can use this as your default for the new configuration.