I'm not an expert by any means, but it looks to me like there are two main issues.
1) The sleeve pitch appears to be off, you hold your arms at least a few degrees farther back than the suit was designed to tolerate. That's probably what's causing a lot of the wrinkling at the triceps and shoulderblades. It also might be what's causing the shoulder divots, 'cause it certainly doesn't look like the shoulder is too wide - in fact, I think it you narrowed that measurement any more you might cause the shoulder to ride up more and throw the whole suit off, which to some extent appears to be what's happening right now. See if you can get this fixed before taking anything in up top, the jacket doesn't look like it could handle much of that as is.
2) As to the flare in the skirt, it's something that I've encountered as well with IC suits, especially my first one. Because the waist suppression tends to be relatively high, when you button the suit up, it pulls the back in a way that seems to cause the skirt to pull away. I think this is exacerbated by IC's high button stance. My solution was twofold. First in my remake I let the stomach measurement out by an inch (anticipating that I'd take it back in later). Then I took it to the tailor, where he was able to take the whole jacket in according to my body contours, instead of just in a standard location. The second part of the remedy requires a pretty good tailor. The bottom 6 inches or so of the centre seam in the back needs to be taken apart and let out a little bit, basically to allow the 'flap' to wrap around your body a little more. I definitely wouldn't have just anyone make this adjustment (I currently have two suits awaiting this move since my tailor just retired a couple months ago), but it really helps enormously, and allows you to end up taking in the entire waist a little if you want.
Again, I'm no expert, this is all mostly from my time reading various tailoring resources - I'd definitely encourage you to wait on other feedback, or go to Styleforum/AskAndy and get some advice there (some may deride your choice of IC or desire for a super-slim suit, but ignore them and you'll find some very helpful people). And I certainly won't be insulted if you or anyone else disagrees with or overrides my feedback, at the end of the day what matters is that the suit ends up looking great. Let us know how any remakes/alterations go!