Could be the paste, I know the stuff is good, but typically is not used between the cooler and the top of the CPU as it liquefies. Try normal thermal past, If it doesn't work then the problem is else where and you simply wipe the paste off and use your liquid metal.
Also at 1.45v with LLC, most likely the voltage is going higher than 1.45v. Check with CPU-Z while under load and see how high it goes, 1.45v is a bit hard on 280mm coolers of the 8 cores as it is, if it jumped to 1.5v that probably would be your problem. the 360mm should handle it though.