I'm crazy over Y-Wing. I find Y-Wing unsuprisingly good... depending how you play. Anyway, straight to the point. I think I have a theory on how to defeat 3 jumpmasters easily, with 4 Y-Wings. Some of you might have tried this one.
Dutch Vander + Dorsal turret + R2-D6 + crackshot + title.
3 x Grey Squadron + R2 Astromech (or any droid at 1p) + Dorsal Turret + title.
During your round, you will be able to have 2 target locks on 1 Jumpaster and 3 focus. When you attack at range 2, you will roll 16 dice. Range 1, 24 dice. Since all the Y-Wings are over 4, they will attack first. Worst case scenario is that you might only make 8 damage on 1 Jumpmaster or less. Normal scenario about 12 damage if the jumpmaster gets 1 evade each time.