Help ...... excesssssssive sssssssssssssssssssss

I would be eternally greatfull of any asssssissstance
given to remedy a condition that my ssssystem is ssspewing
out.

I guess it's called Sibillance.
well it ssssssucks.

I have tried inserting different preamps/amps/tubes as
well as 3 different cartridges (shelter 501 II, Grado Ref.
music makerIII )
no help.

different cables have been tried too.
I used the VPI jig for setting up the cartridge & used magnifing goggles to get it right on the money.
VTF set at 1.75gm
always playing with VTA & no help.

I am wondering if the tonearm or wiring could be cause?

here is my setup:
VPI TNT Base
Teres wood platter
JMW12.5 Arm
Music Maker III cartridge
VPI phono cables

Mapleshade copper ribbon I/C's
Decware Preamp
Decware Phonostage
First Watt F1
Mapleshade Speaker cables
Hornshoppe Horns

The music my system makes is wonderful EXCEPT for the
sibillance exageration, if I can get rid of this problem
I will be an extremely happy camper.