I use a Mac Mini (late 2012 i7) to play FSX and while performance is surprisingly good one thing is sticking out, the awful texture shimmering. I guess this is a common problem with all the intel IGP's. Please try to fix AF because atm it isn't working even if you try to force it in the control panel, even 4x AF would be such an improvement. I actually don't need a dedicated GPU to play FSX because it is so CPU bound, the HD 4000 in conjuction with the i7 gives me better and stutter-free performance in comparison with my FX-6300/GTX 660 gaming rig, believe it or not. So yeah, I know it's been said before but please try to do something about that ansiotropic filtering.
I am sorry to hear that have had issues with the Intel Graphics Controller.
At this stage, the support for your product is offered through your computer manufacturer. I recommend checking the link below for troubleshooting assistance on your Apple computer: