No, I'm not sure how to connect to the RaspberryPi. The controller version is blank. I think that's part of the problem.
Click on Advanced version and give me screenshots of Cgminer configuration and Cgminer status please.
I don't know the corsairs much, but if they come from the same High quality OEM, like superflower or Seasonic, there would be 0 problem doing this.
1000W is their strict 24/7 rating, they've got another 10%+ in peak so its not even close to their limits yet. Non Americans don't have access to an economical >1000W PSU so the RM1000 variants are the best answer.