help! how do i change the BDAC default detonation range?

[lmaoer]

in my ksp file, which i am using the 1.2.2 version of ksp and the ksp 1.2.2 version of bdac, i am having a bit of a problem.

My flak88 has a max range of 8 km but the default detonation range dident change to it, my bombers are set at an altitude of 3 km, so when the flak starts firing, the bombs have already been dropped! ive tried editing the part itself but to no avail, i even searched in the ksp save files, but it dident save when i changed the default detonation range. please tell me, how do i change the default detonation range?