Ill admit, dint read anything but "Get me completionist, i need abcd lives still"
8 barb/6 bard/6 fighter - Swashbuckling Defender
8 Bard/6 Fighter/6 anything - ^
10 Artie/8 bard/2 anything - Swashbuckling Engineer - Enough ap for Fusilade if you decide to range instead of melee. Personally all 3 builds use Swashbuckler + Envenomed Blade/Cormyrian Paralyzer SS.
Pally is a lil different. I would go Dex build ofc, cuz i love dex builds

8 Pally, 6 Rogue, 6 monk - Roughly 56 Sustainable unbuffed dex by lvl 16, not sure how how you can typically get Str unbuffed at that point. But if you do Pally last, you might not need to worry about Str for OC .
That being said, I did these builds for 9 lives, and blazed through them without hating the base class at all. Very strong defense on the base Bard/Barb builds with Everlasting Sap on everything due to the swashbuckler shield. Soloed just about everythign with them 2-4 levels under the quest level. (Elite Demon Den at 15 "solo" Needed to use 2 hires for the final blow on 2 of the djin

)