I can offer my non-expert opinion, so take it for what its worth.
I demoed both of these skis side by side a couple of weeks ago. Conditions were typical for an east coast mountain. Hardpack with occasional ice. A few patches of soft snow to be found. A few places with chunky cookies...
I found the Blackeye a bit harder to get moving than the IM78. They seemed heavier and didnt want to initiate a turn as much. Also putting them on edge took some effort, but once there they seemed to like staying there. They did seem a bit stiffer than the IM78, and much more damp feeling. At times I felt like I was driving a heavy tank through the snow. They felt like a long-turner even though their specs dont seem to say it would be. They liked long sweeping turns.
The IM78 on the other hand I found rather nimble for a wideish ski. It didnt have the sluggish edge change I found with the Blackeyes despite being about the same width (78 vs 79). They were lighter so I found them easier to pop them onto the edges.
Both skis would hold well on boilerplate, but I found the Blackeyes were much more likely to lose their edge before the IM78s did. In places where there were numerous death cookies, I discovered the Blackeyes occasionally deflected while the IM78s stayed right on course. There wasnt much soft snow to work with, but from what I found (which was minimal) both worked fine, but I cant speak for how they handle in anything deeper than a couple inches.
I ended up buying the IM78s in a 165 (I am 5'7", 165lbs, so my length choice wouldnt work for you) and I have Jesters on them. Dont know about your other binding choices.
Of course this is just my opinion from demoing, YMMV