While they (over load mini-spring packs) might not "contact" anything sitting in your driveway, going down the road they do touch the bumpstops quite frequently... When they do touch over a moderate bump, they add to the jarring effect by increasing the overall spring rate of the rear leaves at that instant... basically you feel as though you "bottom out".
There is night and day difference in ride between a truck with the extra spring pack and one without... however:
And after now re-reading the original post, the poster is asking about the actual overload at the bottom of the spring pack and not the added mini-pack over the main pack. IMO, I would NOT remove that leaf as it also acts as a "traction bar" in a sense and keeps the springs from turning themselves into an "S". I think you would most likely start breaking leaf springs very quickly if you removed that bottom leaf.
steved