-spd Deirdre

I somehow got both Sigurd and Deirdre in the same summon, but she's +atk -spd, which is not ideal, since speed is one of her most important stats to let her be doubled less often. Did any of you with a -spd IV get a decent idea how to mitigate that loss? I was thinking of fury and renewal with a spd 3 seal, which helps her speed quite a lot (gets her at 30 + guaranteed 5spd debuff to enemies through spd ploy), but she loses the bait-and-kill potential that QR gives her. QR would be still kind of decent even with Fury, but it would last only for about 2 fights, which is decent for arena I guess. What do you think about that?