Your SH shouldn't be noisy with a decent isolated PSU. The Ciocks is top notch.
There is an issue with greater noise with some of the early SH production units (see my post in Aug 2019 on the SH thread), which has been dealt with on later units.
Chris kindly took mine in and sorted the issue. He offered to do it for free, but given I had bought second hand and it was long out of warranty I felt not paying him something for his time and materials would have been taking the proverbial, so I got him to agree a fair repair / upgrade price. All sorted and working fine now.