it's done with crystal for sweet dark milds. 25% is a lot, but it will work. maybe you could start with 15% or something and see what you think. if it's good, go for 25!
Worst case scenario, your next beer could just have a plain dry malt bill (100% pale and mash at 65-66) - half a pint of each in the glass will make that a low percentage of both crystal and citra. sorted!