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That's no longer exact.

Blow Res+ Shoot Res + Mind Res OR Flame Res + Ice Res + Shock Res OR Wind Res + Light Res + Gloom Res = All Res

Synthesis/transfer rates are the same as ability.

Since it's units, I'd say stick with floors 1-5 since the stage orders are easy and the whole floor set can be swiftly done under 3-5 minutes, thus getting more out of your RDR boosters.

Floors...

The crafted wep will vary much more: between 85-100% of your dmg, average value being 93% as opposed to dealing pretty much max dmg all the time with the non-crafted one.

Btw, I assumed lvl 75...

The best answer one would be able to give you is "depends on your DEX vs the target's". Crafted rares using silver-based materials provide a DEX bonus of roughly 200+ DEX depending on weapon class...