I'd swap D for B, for a number of reasons:
IG-88 B is the popular choice for the built in Gunner-like ability, but you get that a little from Predator. I think B is a better choice than D in general as you get a great ability (with Predator rerolls on both shots BTW) without the drawback of taking Stress.
Stress is the enemy of many ships - IGs are certainly high on that list. The Stress is going to mess up your action economy gained from C. There may be a time or two where you will wish you could do your S-loop with the turn instead of bank, but my money is on the fact that the second attacks will pay off a lot more than the maneuver (assuming you fly halfway decent anyway).
Ion isn't too big a deal as it takes 2 Ion tokens to cause ionization on a big based ship. Unless, of course, your local meta is prolific with Ion. If that's the case focus fire down the Ion ships one at a time as soon as you can. Likely you will have the PS advantage there and hopefully won't have to worry about it too much for more than a turn or two.
Other than that it looks like fun! FCS is money as that gravy train just keeps on rolling and Manglers are also good. Remember that Autothrusters only work out of arc and/or at range 3, so keep your distance a bit. Boosting will help with this as well as help keep targets in your arc. And it's also useful to run if you have too lol.