I got it working using “Set Transform” node, instead of using rotation nodes or LookAt node.
To work you need your projectile model to have it’s origin at 0,0,0.
If projectile orientation is not good, change it’s rotation and apply it with Object > Apply > Rotation
I reported issue LookAt, SetRotation and GetRotation not working on github.
Also playing the game , sometimes physic objects had strange behaviour , like collision while nothing was colliding or some jittering, Armory will need to make physics more stable an reliable.
I hope it helps.