I would keep core and store on the same switch and avoid separating them by a power plug. I had core and store this way for a while and found that I did hear an impact on signal sent to my ID40.

This was potentially because as FLAC was going from store to core through power plug and going back through same powerplug to the ID40 as PCM. To me it was audible and when I moved to core/store co-located (in my case inside the MD600) it was much better.

If you have an end zone only on a switch the this is just one way traffic and is probably not an issue. I don't detect an issue feeding my M80/MS200.

Rgds,
Nick