recently fit the reference design sapphire card with AC waterblock, performing perfectly. My only niggle is that the bakcplate seems to bend a fair bit, tighter to the pcb near the sides and higher in the middle. The thermal pad for the back of the pcb near the ports can actually be slid out theres so little pressure neaar the centre, i also didnt put in the Square pad for the tension bracket on the socket as i was worried it might actually cause damage. Any advice?