The way I see it, there are 2 versions of wizards. The DC wizard, and the Shiradi Wizard.
The DC wizard hunts down every dc and efficient meta enhancements in the trees while keeping spell power at an acceptable level. With a +4 tome and yugo pots, 60 dc necromancy is achievable with a +5 dc item and 18 starting int without too much trouble by going 40+ PM and 30+ AM, 3 necro dc feats and the wizard past life, so long as you take necro SLA line for another 1 dc. This gives you enervate SLA as well, if you choose to go beyond the core point.
The shiradi wizard floods the AM tree with sub points in PM to back it up, taking all 3 mental toughness feats, and going some variation of 18/2 if you value evasion/saves. You select the evocation SLA line for MM/CM SLA's, taking empower/maximize to benefit both. You dump all forms of DC casting on this build, thus it is past life friendly. The difference between a shiradi wizard with 0 past lives and a shiradi wizard with 3 cleric/3 wizard/3 sorcerer/3 favored soul lives is 120 spell points (go farm a bauble for 2-3 times this bonus).
What do I prefer playing? The DC wizard by far. What is more effective via current game design and massive boss hp/lack of efficient damage spells on a DC wizard? Shiradi. The necro SLA line is absolutely useless on a boss and the arcane blast/necrotic line do not receive meta bonuses for some bizarre reason.
60 necro DC is barely sufficient in EE, requiring at least one energy drain to pull it off. By focusing so hard on necro DC, you completely sacrifice any other DC from functioning, such as conjuration and enchantment. Why such focus for trash mobs that doesn't function on orange named on EH+ is still ineffective is beyond me. I'm sure evocation sorcerers feel the same way.
I'm aware EE is intended to be difficult, but there are builds soloing it currently, so don't give me the balance speech.