There are a few ways you can go that I've tried. Keep the Cupidus... es? Cupidi? Whatever. Keep them disabled. Stun, freeze, whatever you got to make sure they can't do their A1 AoE counter attack. This is what I do. Between Scyl (in a stun set), Ragash and Ninja, they don't get to do much. Alternatively, burst them down with single-target nukers before they get a chance to do too much damage. Or, I guess, tank up your team, get a Geomancer or two, and watch them destroy themselves against his return damage.

I am going to assume no seer?

Before seer i did difficult DT hard rooms with control teams, freeze/provoke/stun - never let them get a turn.

Can you post your roster, I am curious to see what combos we might have to CC them.

This floor gave me trouble so I switched from my seer comp to a team that can soak damage up and just win the long fight. Did this on a few floors. Two fusions/Mithrala, could probably substitute others but just showing a non seer example.

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Very important to show roster during these questions. Every account is different, so for every account, there is a different way to beat every stage. Show us what you're working with, and we can figure it out. 

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My bad yeah I should have posted that before. I've tried a few different groups this being the last one and it just went horribly

Try switching out truda for Mithrala.

Think your problem is mashalled and trunda are probably glass canons and are going to die over and over to the cupidus. If that doesn't work drop salad for drex maybe.

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Finally oh my god. Going try and keep with the don't give them a turn strategy 

I tend to put Duchess as my aura lead. And like someone mentioned, you may need control champs. How are your Scyl, Basher, and Miscreated Monster?

Scyl and monster are ok but haven't built up their masteries fully. Basher is still pretty low