What do you mean by Necro Caster with 10 warfare? that seems bad.
So i finished this game on Tactican mode aaand from my experience i'll tell you that:
Shields are useless untill you can manage your phsyichal armor boosts (fortify etc) you just lose damage.
Necro is not that good since you recover only when dealing damage straight to health (if you have 10Necro Mage, he will heal only after he breaks magical armor, if you have Necro Melee he will heal only after he breaks psychical armor) so its not that efficent.
Summoner is efficent, but trust me you gonna get bored as f... playing this 1 thing class :P
I recommend you picking either full psychical team, or 2 psychical (1 melee 1 ranged) with 2 magical characters and a lot of CC (means stuns etc) because without CC you will get crushed later in game.
Last thing:
2x Lone Wolf is easier than 4x party since with 2 characters you only need gear for 2 characters that means you got 2 good geared characters instead of 4 running in bad gear, and Lone Wolf is damn powerful perk.
