Question about Defence in Inferno

Hey guys, I‘m very inexperienced at PVM (couple hundred Vard kills, some Vorkath, a few entry TOAs to get Elidins Thread) and I‘ll give the Inferno a shot in the next couple of weeks.

I have pretty much max gear and will take in Justi because I‘m garbage at the game. A good friend will lend me his Ely, maybe I can even convince him to hand over his Tbow for a couple of weeks as well lol. Does it make sense to get my def up to 90-95? Im currently low 80s. Or does defence not matter all that much considering my gear?