No, the BQ fans didn't seem to work that well with the iCUE software.Did you record some temps with the Bequiet fans for comparison?
You are getting really nice ones with the Corsair fans btw!
Looking at the picture, isn't the SSD blocking a lot of the PSU exhaust?
The structure you refer to is the mounting bracket I made. I've posted a close up of it before on this blog, but I agree, it looks a bit like an SSD from that angle. The bracket doesn't block the PSU exhaust, fortunately.