I would have thought dampening down the vibration in the springs too much might have reduced the amount of vibration going from trem block along the springs into the claw and then the body. That was my concern about going too far with this.
I just had chance to play my guitar louder and that 'reverb' style noise is gone. I can't really hear the other noise so much. the high pitched one. but ill look out for it.
I didn't want to put stuff in, over or around the springs that could potentially get caught in the coils or gak up my cavity.
I just tried to find some stuff on the noiseless springs, one guy claimed they made his whole guitar sound muffled, but most reviews seem positive. still, what i've done works. so no need to buy more springs.