The easiest run through all the toughest tactical mods, on insane difficulty i had, was with following party..
Sorcerer - main everything. He can run naked, and still will solo the entire game.
Wizard Slayer/Thief - ranged physical dps, mage crippling
Anti-Paladin/Mage - dispel, dps, tank
Cleric of Talos/Warrior - dps, tank
Swash/Cleric - tank, healbot
Blade - tank, tank, tank (tank) The only Class with good enough AC for tactical mods
How did it work out? It's an all tank (except for the archer, WS/Thief), all dps party, that's how
From my experience one well prepared spellcaster (sorcerer) is enough to take out everything, that is to be taken out by magic.. While tanking the entire world, and buffing all allies. I did however dual the A-P to mage to give him some well deserved protection.
You could do the same without the Anti-Paladin/Mage, by simply making him another Sorcerer, but TWO sorcerers? No.. Just no.. It's like a "I Win
NOW" cheat.
I don't realy see that much problems with Your setup, except for Totemic druid/Mage. I'd leave him the druid that he is. For the last spot, ofcourse, an archer.
With this beign said, i'd focus more on physical dps, but that's just personal preference. In my experience one sorcerer is even too much for everything that has a "magic" tag. This means that you could even kick out the druid, and add another character with physical damage (+ few mage levels to get all the protection spells, or few cleric levels to get OTHER all the protection spells)
A good character, that has to be build very slowly, is a combination of barbarian (or berserker.. i always confuse the two) dualed to cleric. Or started as a cleric and dualed (using SK to add the kit).
Make him flail spec, give him DoE, pop Armor of Faith, add the passive DR from berserk / barbarian, and there you have a tank for.. say.. Yaga-Shura with Ascension and SCSII
Just remember, that with improved AI (with SCSII for example), people protected from magical weapons are ignored.
Regards
Edit : On the other hand, in multiplayer session, where everyone unpauses, its nice to have pfmw
And with this beign said.. I'd like to participate in a 6 sorcerers run!
Edit 2 : Or a 5 Sorcerers and RPGguy as Cerndt run

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