My unit had a severe case of harsh highs, it was apparent on cymbals and vocals especially women voice. I thought I had a defective unit, but sending it back to Monolith is too much of a hassle, so I bought a pair of Vegan pads to remedy the issue. The highs were less harsh than before but it was still there. After looking around on the net, I found a reddit post that suggested to use duct tapes over the driver on the earpad. I experimented using a few types of tapes and found masking tape produces the best result for me. No more harsh highs, bass is a little bit better I think.
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What pads are those? I've also heard a lot about cases of harsh highs, you could always try the old toilet paper method