If the guy is competent he should be opening supppper wide, so you can jam lighter, but ICM is pretty delicate with 2nd to 4th all even stacks.
A shove here puts us a clear 2nd though which is rather handy.
What do you perceive he will call you with if you shove? That's going to affect things...
Against this guy I'm probably shoving:
A8s+, AT+, 66+
Against a TAG your range should probs be more AJ+, 88+
I'd guess he's calling something like pairs, any ace, most broadways
Your shoving range is actually wider than I thought people would say.. but am kind of relieved if thats correct

I had AJ and thought it was easy shove at the time, thought after it might be wrong given the stacks of other players and ICM... obv i'm well ahead of his range though