I think putting more points into Serrissu is the mistake. Make them think about targetting the buffer that doesn't do much damage or the shoot at the person who benefits from Serrissu around. Oh, and her PS 8 is great with VI. That's about all I'd do for her. She might even get a barrel roll or something to R1 of a target to fire.
It's funny, I was just trying to process this very idea a couple days ago while theory crafting.
On one hand I agree but on the other hand if you don't up her damage output potential then you've sunk 20 points into a ship that you expect to die really quickly that has done very little to help eliminate enemies.
I want to like her or at least be able to fill a need in my lists but I'm not sure she is capable.
I'm thinking that waiting for the Kihraxz is the answer, lol.