Conjoy's page

Eldritch Heritage Feat going Arcane bloodline.

If you found full caster overwhelming I would steer clear of Magus - Spell Combat and Spell Strike confuse even experienced players regularly.
WarPriest takes you back to the issues of a prepared caster - I would strongly suggest spontaneous caster such as Oracle or Bloodrager.

To the OPs assertion, I think it's worth noting that some characters can really specialise in Knowledge and it can be a huge weapon/benefit for the party. If someone has an Alchemist or Investigator with enormous Knowledge checks (a Mindchemist can have +30 before rolling easily), then they should be suitably rewarded.
But I also agree with the positing above that the info provided should be both useful and relevant to the characters history. A successful identification check for an adventurer represents them recalling research they have conducted previously in the heat of a deadly situation. The higher the beat the DC by, the more likely I would be to ensure they get the crucial information. For eg, if the group has certain standard questions they cover like DR and/or elemental resists, but they've made the DC by 15+ and the usual questions are not valid, I may give the crucial piece and give them one less question, because although a melee character may always be interested in the DR, if he has researched a creature that splits into multiples every time it is struck, or damages his weapon, then that is more likely to be information his character would have been most interested in.

I think your original idea of Mystic Theurge has merit. Try to sell early entry via an SLA to your GM otherwise take Equipment trick Sunrod.
With the Cleric and Wizard chasis you'll have the healing and status removal covered for out of combat, but still be a primary Wizard caster for in.

Random question, slightly off topic, but so I understand, it seems to be a given that people are using 10 as the base AC for the target square, but isn't it AC 5 to hit an unoccupied square?

Just to throw an option out there to actually fix the character you have. Take a level of Cleric with a god that has Unarmed Strike as its Favoured Weapon, take the Feats Channel Smite and then Guided Hand to get your tasty Wis 18 to be your to-hit stat.
Swap Power Attack that you don't qualify for, with Piranha Strike that you do. Still won't be massive damage, but you should hit a lot more reliably at least.