Hard to tell without knowing your dmg and hp, because it may be a significant part of your issue. Main problems I see:
1) You are using up a passive slot for evocation, but only have 1 skill that has a cooldown (forceful wave)
2) No armor skill, if you are soloing and dying frequently having an armor skill may significantly improve your survivability. I'd ditch sparkflint and replace with energy armor(personal preference). Since you have Astral Presence, energy armors -20 AP will drop you back down to 100 (which is worth it IMO), you can use absorption for AP boost til you hit 48 and then bump yourself back up to 120 with the 48 rune if you want. No matter which armor you decide to use, replace evocation with galvanizing ward, the life per tick is helpful on top of the added length. I really see no reason to use evoc with only 1 cooldown spell.
3) Your primary spells. I know lots of people like piercing orb, i find it to be too slow and too inaccurate for most situations. Electrocute +Surge of Power is instant, accurate across the screen, and will fill your AP back up quickly, but thats just a preference, orb is fine. I ran with Disintegrate +Volatility for most of NM (if your dmg is high and can easily kill most trash in a second or 2 with dis, the volatility explosions make a HUGE difference for clearing large groups, but its not ideal for every situation) That said if your dmg isnt high enough to cut through trash fast, disintegrate leaves you very vulnerable while channeling. If you are dying a lot it may be because of this. Which leads me to...
4) Hydra: Its very very tough for me to ever get rid of hydra. In your build (just my opinion) you have 2 "Oh S*it" spells, DS and Wave of Force. I used a similar set up (switching between WoF and Frost Nova) until i realized that i was using them both too often, and if you are using them it means you most likely arent casting anything thats doing any damage. Hydra is amazing not only for scouting, and casting through doors. But even if you cant cast any of your primaries, Hydra will still be doing damage. I ran with arcane for a long time because its nice AOE. Venom is far superior damage wise, but you need to keep your enemies standing in its pools for maximum effectiveness. In my build below I subbed Dis for Blizzard, and it keeps enemies in my pools for longer.
Im 52, 7k dmg, 14k hp.
My main strat for both solo and group (except for bosses). Pop Venom Hydra, Lay down 2 blizzards around it, whittle away the whole group with electrocute +AP regen. I very rarely have to pop my DS. This has worked well for me, but the great thing about the new skill system is it gives you lots of variety in your options.
Cheers! (and i hope you dont die so much anymore)