So having play tested the Rear Admiral quite a bit with this setup
It has worked quite well against a variety of opponents. The 4-5 dice with better luke on your initial roll has devastated anything trying to get within range 1-2.
The current build is to use a loaded up whisper as well. Two ships firing at 9-8 and dealing 8-10 potential damage between the two. However after the playtesting I did find that even with the crits RAC puts out there seems to be just a slight lack of firepower by a fraction and it comes mostly at the range 2-3 ranges.
I will be swapping RAC to look like this