I think it's worth having a turtle set where you're not dependent on Shell. Context matters, and in a fight like Arebati, depending on what strat you're using / execution of the strat, you could end up getting hit with dispels. Sometimes the healer is too busy or slow to get to re-applying Shell.
The Hybrid set above is definitely fine, but for those that want extra MEVA + DT, the below set is even in offense -
ItemSet 400567
Ton of MEVA from slotting in Null Shawl, though it's technically 3 DT off from cap. You can swap a Moonlight Ring for a Defending Ring to cover the gap. Dedition / Telos / +1 DNC earring, are all acceptable swaps as well. Can also swap in a Yamarang if you want to squeeze out a little extra MEVA.