for some reason, the thermonuclear bomb's explosion starts from the player's position, not from the misile target, wich among other tthings, hurts the player

he's right, which makes the artillery useless since the wave doesn't spread from the point of impact.

Oh, I didn't think about that, but yes, probably useless, and probably deadly too

I ran across this too, though there was some weird stuff, like it starting from the player but still only being in the circle it should be. I think I managed to fix it by adding the line:
trigger_from_target = true,
under "target_entities = false," in each "nested result" block (3 for thermonuclear, 1 for nuclear) in prototypes\items\projectiles.lua

shadefang
that's awesome mate. works like a charm, thank you.

Oh god... let me fix this, I don't know how this one slipped through the version changes...
Updated, thanks for the find, and thanks shadefang for the solution. Also, sorry for the delay in fixing it.
I should actually check to see if the arty shells are buggered too...