I've been fiddling with something similar, only with Epsilon Leader in the Colzet slot as Rebel Captive insurance. Although I've got a nagging feeling that having a TIE/FO as the 3rd member of the squad means that Whisper kind of has to run FCS rather than Sensor Jammer to keep the damage level up, which isn't ideal against TLTs.I'm favouring a 3-ship build now:
Fel PTL RGP Targeting Computer AT
Whisper VI FCS ACD Recon Spec
Colzet Title Autocorrector
I have also noticed this. SJ lets Whisper hang around longer, but getting a 4 die reroll allows you to bring the pain. I don't know which is better for me.