Power Plant and Noise

Anyone have any thoughts about the line noise the power plant is injecting into the line?

I do think my system sounds better with the P12 and I am mitigating the noise by running all sources (Dac, Server, Switch) after the Iso Transformer. The amp is the only thing direct from the P12 (because it makes the Transformer hum).

Will also be curious to check system without the transformer in the mix.