New Kiseki blackheart cartridge not sounding right.

Excessive sibilance can come from incorrect VTF, VTA, azimuth, antiskating. I assume that your tonearm bearings are in perfect shape.
Pronounced upper frequencies due to loading or wrong VTF and VTA.
Your cartridge is new, and assuming that your basic alignment is correct, run it some hours with full tracking weight and then recheck your settings.

I think, the loading is wrong. 

Thanks everyone. Biggest issue with the Kiseki is the cantilever and stylus are so far underneath the body it makes trying set the overhang and horizontal tracking angle almost impossible. You just can’t see it. I had to go from a Wally tracker to a GEO-Disc just to get it close. It’s sounding better but we will see.
Mike

"cantilever and stylus are so far underneath the body it makes trying set the overhang and horizontal tracking angle almost impossible. You just can’t see"

Looks to be the same arrangement as the PH/Blue.

I have terrible vision. A good light and magnification is all that's needed, along with patience. Adding .5 or so tracking force may help.

Try dropping the back of the tonearm just a few mm at a time.