Thosha Very good idea to put a list of purchased items together. In some places, they help enormously. For example, in the 2nd Lustlord fight you state:
"Qum: Zirantian Vibrator, Sexual Pin, (buttplug if you have it, I didn't buy it)"
The buttplug helps enormously. With it, Qum can start casting Arousing Aura immediately. This reduced the demand on Carina for Mass Healing and adds greatly to the damage that Vhala and Varia do to Lustlord. With your recommended equipment loadout and that one addition for Qum, you can count on beating the Lustlord pretty much every time unless you get truly unlucky in Vhala not reducing the Lustlord's attacks.
Your loadout recommendations are very good for this fight. With the Crusader Sword and one Reforged Givini Blade, Varia can dish out some truly stunning amounts of damage, particularly with a few critical hits. One additional recommendation from me for that fight: equip Vhala with the Breastplate De Iris. With all that elemental resistance, Vhala can pretty much sneer at Lustlord's attacks.