In Rise of the Separatists, they introduce Buzz Droids, which in groups of 2 or more do 4 planetary scale damage and have Breach 1. If your fighter has decent armor (3) you can last an okay amount of time, so I don't think that the damage is wrong, but it seems that unless you have an astromech, 2 Buzz Droids is a death sentence for your fighter. How would you get rid of them? Do you basically just have to do what Obi-Wan and Anakin did in RotS er... Revenge of the Sith, not Rise of the Separatists, and hope you don't roll a despair and kill each other? Or is there some other way of going about this? They don't really state in the book.
The main point of this is: How do I use Buzz Droids without a very high chance of outright killing the PCs' ships?