Dynavector XX-2 MK2 vs Shelter 901 MK2


I have upgraded my Clearaudio Concept to Performance DC with Concerto V2 cartridge but I find it sounding bright with vocal sibilance on some of my vinyl collection. Set my phono preamp to 25ohm to tame the brightness. I triple check all my alignment, tried different positions to no avail. I am using the Clearaudio Alignment gauge which I tried the Clearaudio recommended and the IEC standard. Seems like I hit the dead end so I decided to try a much warmer cartridge either the Dynavector XX-2 MK2 or the Shelter 900 MK2. I listen to all genre except classical but mostly rock.

If you have experience on either or even better, on both cartridge please advise.
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Stringreen,

That is what I thought before. Did took pictures and videos of all my adjustments and sent it to Musical Surrounding. I wanted to see if there was something I missed. They said everything looks spot on that's why I got my replacement. Realignment of cartridge is done everytime the arm is raised or lowered. Will the vocal sibilance disappear as the cartridge gets older?
Yes I did. Mike is an awesome dude. He is the one who assisted me on this. He said everything checked out so he replaced my cartridge.