First, shells do not fall on the entire designated area, but only from the initial 3rd strip, and the last 3rd strip(at least, you can make the shells fly along the entire length of the designation areas), and secondly, the first and last projectile always hit, almost in one place(it may be worth making these shells as random as the rest of the MLRS)
P.S. I hope you understand what I wrote correctly
Adding scatter would make the barrage harder to dodge though. Seems like a double edged sword.