I don't think any balance changes for hybrid mounts should be done globally.
Per-ship balance changes, though? I'd like to see the Hammerhead, in particular, have a bit more reason to consider energy weaponry. Then again, I'd also like to see the Hammerhead have all four small mounts able to fire forwards again, even if that came with swapping the rear turrets to pure energy - used to be you could drop LRPD in the rear turrets and have that be the ship's PD done with. Now? I basically always end up leaving the rear turrets empty and using converted hangar to cover PD, which is... nice to have as an option, but annoying to have as the default build.
I'd also like to note that, even if you're just looking at raw damage profile, there's at least one energy weapon at each size that ballistics just doesn't have a direct competitor for. For small slots, the antimatter blaster is unmatched in both armor penetration and burst damage. For medium slots, the heavy blaster is unmatched at just raw DPS regardless of target (if you can afford to fire the thing at all). And for large slots, none of the ballistic HE weaponry can compete with a Tachyon Lance on any metric other than ordnance point cost*.
* Edit: or, arguably, accuracy against frigates while mounted in a turret and left under AI control - for the player, the tachyon lance is far more accurate, but the AI's decoupling of ship maneuvering from weapons-fire gives it a bad habit of forcing the tachyon lance off-target.