LogFAQs > #955368826

Yes, Titan's wall goes up three times: 70, 55, 40. If the dyad finisher hits hard enough, you might be able to skip one of those (by going straight from 72% to 53%, for example), but that's a big ask. And even then, you've still got one wall-breaking SB left, to deal with two walls.

The normal way of getting past those walls is an OSB. Unfortunately, Alphinaud and Wedge don't have OSBs, and Papalymo's is fire. Fujin and Ultimecia do have wind elemental magic OSBs, and maybe some others. You could, conceivably, buy Fujin's OSB and her SSB (instant cast, En-Wind) and use her to bust walls.

Also a buff question: am I correct in thinking that all of the following stack?
Overdrive attack/magic/mind buff
Deuce's Concerto (+attack/magic)
Papalymo Leylines (+magic/haste) [this is the main reason I brought him even though he's otherwise useless]

Yes, those buffs all affect different stat combinations, so they all stack. (Although, if you had Alphinaud's wind chain, its +50% Magic bonus wouldn't stack with the +30% from Leylines; instead, the second one used would replace the first.)
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I don't like this duchy. Now, it's an adventurer.