Hey Virtual Rain,
While I work my butt off to type up some coherent answers to your complex questions about multiple blocks (sorry for the delay, but I had to deal with the issue of the MCP 355 failures since that affects so many XS members) could you send us some pics of your setup?
Even though, for the reasons stated above, I feel watercooled PSUs are more trouble that they are worth (especially for noobs), it would still be fun to see yours in action.

Whadda ya say?

Jay