I have not skied the movement Jam but I think all their skis are much more focused as Off Piste skis. Diana had a pair that was 93 underfoot in MT. I did not ski it, but Max skied it and so did Harald and it was a softer ski that was great in pow. I am looking for a ski that is distinctly similar to the IM 78 but just a bit wider. I also love Head skis and whereas some will say that they lack pop, the good Head skis pop like crazy when they are bent. The give out as much energy as the skier is capable of giving them. If you don't bend the ski, they will feel damp (and some call this lifeless). The beauty of the IM 78 is that it just rips hard snow. I love being able to do both on one ski for days when there is not fresh snow (or maybe just a little). And I do hate giving up what the IM 78 gives me on groomers and this is why I only break out wide borads when there is a lot of fresh snow (98mm under foot daily drivers are just not for me because I give up so much on groomed terrain and wheras you can put them on edge, it's hard to call it high level carving).
In reality all I really need is the IM 78 but there are some days when just a little more float and a litttle wider ski would be just perfect as long as it will still rip groomers. I think the Peak 84 is that ski. We will see.