So I have 7 games of twin IG88 builds under my belt. Here's my takeaway so far:
If you fly IG-B mount FCS. NOPE NOPE NOPE TO ANY OTHER SYSTEM SLOT. Advanced sensors looks good, but FCS is just better ALWAYS.
Autothrusters are TOTALLY worth it. IG excels at the range 3 shot.
Avoid upgrades that cause stress or are action dependent. IG tends to boat stress like crazy, because he frequently has a hard time shaking it.
HIT AND RUN. IG excels at the shoot and run. Attack at range 3 whenever possible, avoid close range slugfests.
MANGLER MANGLER MANGLER. It wins games for you period.