There are a few of us rocket jockeys out there, that do quite well, thank you.
Most of my bomber kills this tour...and all other tours,(~80%) are with rockets.
Late War Tour 133
Kills by A8Moray in a
Bf 110G-2 by model type
Model Type Kills Percent
B-17G 4 19.048
B-24J 4 19.048
F6F-5 1 4.762
La-7 1 4.762
Lancaster III 7 33.333
P-47-D40 1 4.762
P-51D 2 9.524
Typhoon IB 1 4.762
21 Kills
And yes, Lancs do have a very soft spot for Wgr-21's. Two full formations were killed with rockets, in one shot.

The 17's I killed 2 of with rockets, the 24's 3. (another full set downed in one 2 rocket salvo) The 17's seem to have a thicker skin, honestly. I don't remember ever popping a full set in one shot.
If I remember correctly the La7 was a rocket shot too, but I'm not positive.
Your assessment of <5% bombers killed by rockets may be true, but I assure you it has nothing to do with the actual effectiveness of the rockets. They are absolutely deadly, if you take the time to learn how to aim them. They're not AAMRAAMS.
As far as fighting in the 110, If you're smart, she'll reward you. Many see 110 and figure easy kill... but an experienced pilot will make them pay. Ask the guys who were flying the 2 P51's that make up that tally. They started out as a section... and ended as a section... in the tower
