I'll lift a GV to counter sometimes, but I prefer being in the air against them.
I usually love flying CAS against GV's, but the IL2 and Hurri-D, and maybe the A8 are the best we have in the game for those roles.... they are just not up to taking on a half dozen Osties working together alongside the other mud suckers. 110's have the cannon and ord, but even a bigger target to massed Osties.
I've also had success in the past with the bombs and cannon on the Ki-61 (think something amiss in model for Ki's cannon, in it's favor to taking out turret and tracks), and making use of it's speed once you've built up some E, but you have to get in real close...... also pretty hard with so much counter fire happening.
What planes have others been having success with in CAS role against these massed GV tactics? And I don't mean taking advantage of damage model to get the "kill" on a Tiger by firing .50's at it.