I've had some success with Vader, especially with Proton Rockets. Fel is always a safe bet. Not sure about the Sigma. Kinda think they can work well as a team or independents.
TIE ADVANCED: · DARTH VADER
Veteran Instincts
Proton Rockets
TIE PHANTOM: SIGMA SQUADRON PILOT
Fire Control System
Advanced Cloaking Device
Intelligence Agent
TIE INTERCEPTOR: · SOONTIR FEL
Push The Limit
Targeting Computer
Royal Guard TIE
Hull Upgrade