I'm not trying to be a "troll". According to your own post you have ambients of 24C, which is 100% normal. Most people on these forums have 20-26C ambients, so 24 is 100% fine.
I'm not saying you made a mistake buying these, I'm trying to point out to other people reading the thread how good watercooling your GPUs is.
As for proof, ask anyone with a full cover or core only block what their maximum load temperatures is, most people will answer something in the 40-50C range (Depending on card model).
I used to have an MCW60 on a GTS 250 and at 800 core I loaded at 36C.