Ok, so I've only run three heroic instances and all the solo advanced instances once as part of the sig line, but I have noticed that almost every piece of gear is the same "level". So a solo crate item is + 160 stats, etc etc, and a heroic legendary chest also drops + 160 stat stuff. In my mind, heroic gear should be better. It was in skyshrine after all. It requires teamwork and more commitment. I actually think the base 160 for L92 gear in heroics is about right, but therefore the solo instance stuff shouldn't be more than 145-150 base stats. After all, the sig line is giving out 132 stat stuff, so it should be just above that. Come to think of it, I think I got a + 179 stat cleric arms from a solo instance random crate, which is way better than anything I've seen in my (admittedly limited) heroic experience.