when i was running the 1.8l i tried everything to stop the lifter noise best thing and the only thing that really worked in my car was ( not that i recomend it) castrol magnatech 10w 40 and STP engine treatment can get it from repco and supercheap its cheap worked for about 3000kms and it slowly came back after that my lifters where shocking.
Did you try ProMa MBL8?