Hi,
There are a few things here:
First there should be a button to toggle on/off the snap to grid:
Next you can open the Drawing Aids palette from the Windows menu. Here you can adjust the grid and turn on/off aids:
If you go to the Layout palette you can st the y coordinates of the objects and the margins:
If the objects have different borders or margins, then you will need to adjust the y coordinates. You can also just type in a new y coordinate to 0.0001in accuracy.
Hope that helps,
Niall