I would try a5 for tac bomber
I like it too.
Fighter A4 D5 vs TcB A5 D4 would be like mirror.
One is better for defense the other for offense.
Also, it keeps StB superior with A6.
My personnal taste would keep D1 for StB.
StB will still remain OP and an issue with Dark Sky.
All this is really about what you are aiming at and what is considered an issue in OOB roster.
Cruiser is slightly buffed considering how it is currently underpowered.