There are experiences from the Taiko thread that the new Lampi XMOS is better than the old Amanero.
So I would first go for the XMOS board before other changes.
Maybe a better solution would be to go for one UHQ server and connect via the XMOS USB to the GG2, so I would compare the SK to other one-box servers like Antipodes K50 or Taiko Extreme if funds allow.
In post # 25 I was wondering if by doing my DAC double reclocks of the incoming USB signal, it wouldn't be the Innuos Phoenix redundant and would make little or no improvement. Now I know the answer, the Phoenix is a magnificent device that clearly improves the sound of my system.