So, when a large base moves 2 or 3, does it overlap squadrons placed in front of it, nearly without fail?
For speed 1 or 2*, yes. Speed 3 (more like 3.5 distance) no chance. At speed 3, the base is entirely forward of the speed 1 location. (just about the middle of where the 1 cardboard marker is.)
*Speed 2 you can with 2 clicks (like an ISD or MC80) avoid a fighter to the right or left side, by turning away from them, but not the center. Straight or one click won't do it. (Unless just barely touching the front corner (Place base so that the center is as far to the right as possible, and forward while touching. If in the middle, you are good. On approach, if you first move about 1-2 cm forward of the large ship, there's no chance to avoid. Even if they escape (and let a fighter dictate position!) that's still 3 (assuming a squadron command moved them into initial position) turns of fire, 2 front, 1 back. If you can't keep to the center (For example multiple squadrons): against an MC80, go for the far side, as they want to keep the range and on an ISD the near side, as they want to close.
