Made an early call on the toilet noise. Subsequently have realized we are back to zero. Heard noise when kitchen faucet on and at turn off. Also can hear hum near front of house when MBath faucet runs. Seems our fix has not worked so now scratching head!!
What makes it more interesting is that 2 days ago the leaking single lever kitchen faucet was repaired using the Delta supplied new parts and is like a charm now - except for the noise.
Noise level in general is not as loud as before the ball valve installed, but seems to becoming a bit louder as the hours pass. If I was bald I'd be in trouble but there still is hair to pull!!!