Looks like a rebranded EK kit.
its difficult, not impossible but difficult to idle below ambient on watercooling
You'd need an evap tower to barely reach sub-ambient...so don't think he's getting it with that kit.
OP- what is your ambient room temp? What are your load temps? It's normal for an OC chip to run warmer; remember, you are pushing more current through the chip and running it at higher clock rates.