The effects mods I've used so far have had a problem which bugged me. Planes exploding in the air *always* had their blasts directed toward the east, no matter their attitude or direction of travel. It's just like detonating a bomb planted on an east-facing wall, or cliff.
This happens when the effect's emission of particles is constrained. To ensure the blast is symmetrical, make sure the values are:
EmitTheta 0.0 180.0 (if the parameter is in degrees, which I doubt but do use), or
EmitTheta 0.0 200.0 (if in gradians, which I think is really the case.)
This will emit particles over a full sphere (or over ~340 of 360 degrees in my case, if gradians is indeed the angular measure.)
Originally I would find something like:
EmitTheta 0.0 20.0
This tightly constrains particle emission to within only 20 grad of the reference axis (which for airbursts is directed horizontally toward the east.) VERY ODD for exploding planes, certainly if heading west.

The effects to check, in 3do/Effects/Fireworks/:
Tank_Burn.eff (makes fireball)
Tank_SmokeBoiling.eff (makes smoke cloud)
Tank_Sparks.eff (generates glowing particles flying outward)
Tank_SparksP.eff (generates opaque particles flying outward)
Naturally, other parameters should be tuned so as to suit a spherical instead of a directed blast...