MasterShake2 :
I find your assessment really interesting.
I think that people compare Y-Wing with Tie-Bomber, because the K-wing is really not worthy the 40 based point it is costed at. Actually, a K-wing VS Tie-Punisher thoughtful comparison would be great.
I have been playing non-turret Y-Wing (Dutch-R3 / Proton Torpedoes) with a lot of success for the past few weeks. I can definitely see the Y-wing acting as Rebel Bomber. Point-wise, I believe they are OK. One change I would put to them: White Reload action.