Lusche, you and Widewing seem to be the keepers of all the obscure data. Do you have any idea how many allied planes were downed with R4M's?
But the effect of R4M rockets was not only in its immensely destructive power.
A cloud of rockets bursting, damading planes and scattering formations was a powerful side effect.
After a rocket attack the bomber formation could be devastated, planes flying singly, vulnerable to attacking fighters... What if bomber was damaged, lost its place in formation, flew homewards singly, perhaps coming down from the damage. Just forcing the bomber back wounded was a mission kill.
So we can't think of just direct kills by the rockets, their "side effects" were as important as their power to destroy a heavy bomber.