Okay, the funnel doesnt show the projected path of the shells. Thats the misconception.
The Firing Evaluation Display System (FEDS) shows the projected path of shells fired, and is used in level II (no lock). In level III and up, the Bullets At Target Range (BATR) symbol is used instead to show where bullets passed the target.
In level II and III, the funnel works very similarly to with LCOS. It does NOT show where the bullets will travel. In levels II and III, it shows a range of valid solutions for the current normal acceleration (G) in plane, with the wingspan currently selected being used as the gap between the lines of the funnel. In level IV and V, the funnel is in the targets plane of motion (POM) rather than your POM.
Thing is, your target isnt maneuvering, so picking their plane of motion is a bit of a crapshoot.
I guess Id suggest having another look at the EEGS symbology levels explanations, particularly the explanation of how the funnel works? The short version is that the funnel isnt showing you where the bullets will go, its showing you how much lead you need - and once you have a radar lock, it starts showing you the lead in the plane of motion of the target - which is VERY useful for figuring out how much lead you need to pull when you are not in the targets POM, such as for snapshots.