Well, the "cap MDT first and then do MDB" is a nice rule, but it's not *the* rule. Here is a 50% set:
Main: Kebbie
Ranged: Lamian +1
Earrings/Rings - Merman's (12%)
Head/Body/Hands/Legs/Feet - Coral +1 (13%)
Waist - Lieutenant's Sash (2%)
Back - Hexerei Cape (3%)
~-30% Magic Damage Taken (Shell IV is -21.9%, so this puts you a little over cap)
You'll probably be better off with Ataractic Solea most of the time if you're giving yourself Shell IV. If you're getting Shellra V 5/5 and going over cap, you can swap the Coral hands for Duelist's Gloves (+1) and the back for Lamia Mantle +1 and take even less damage.
I think my RDM/NIN -MDT set for tanking used to be:
Main: Kebbie
Sub: Axe Grip
Ranged: Lamia Kaman +1
Head: Coral Visor +1
Neck: Ritter Gorget (I had Prudence too, but figured I might as well go with HP as a taru)
Ear1/2: Merman's earrings
Body: Coral Scale Mail +1
Hands: Duelist's Gloves +1
Ring1/2: Merman's Rings
Back: Lamia Mantle +1
Waist: Lieutenant's Sash
Legs: Coral Cuisses +1
Feet: Ataractic Solea
-23% MDT (Shellra V caps at -27%), 25 MDB (12 from trait)
.... too bad I play on lolPS2 and it took me three macro presses to get into and out of that gear.
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