Your ehp is way low for mp10 ubers. You're at 257k ehp without dodge, and you really want 350k+ for mp10 ubers. I prefer at least 400k. Your profile shows about 590 all resist, you want to be over 800. Armor is not as bad, but you could do with over 4000. Finally you want to add some hit points so you can avoid being one or two-shot.
That's on the defensive side, on the offensive side, your attack speed is low. Most people want to hit the 2.73 attacks per second break point, at minimum you want to hit the 2.5 attacks per second break point. Dropping your storm crow for a mempo is probably not the route you want to take to get there though. You need to get an APoC source if you get a mempo and it becomes a very expensive upgrade. You can usually do better keeping the storm crow and upgrading elsewhere.
As for your gear, do you use that hellfire when doing ubers? It's not very good, and you'd be better off with a ring with crit chance and attack speed. If you stick with rare bracers, you could look to add an armor roll, or try to craft an upgrade. Ice climbers could use a vitality roll to give you some more ehp. Nat ring and boots would up your crit chance, but your CC is not that bad if you lose the hellfire for a CC ring, and you probably lose ehp compared to a decent ice climber/rare ring combo.
Your chest is an ehp blackhole, look to get at least one or two of all resist, armor, double vitality on a tal chest. The blackthorne pants are not terrible, but again you can look for at least one of armor, all resist, and double vitality. You have a really good WH belt for dps, but again it an ehp loser and needs one of all resist, armor, vitality.