mac here , hey EX-KAT-35 gives the first sensible question , since aftermarker ENKEI your running ,and EX-KAT-35's 5 wheel chart with the different shape seats - thus needing those odd(not ALL odd) shaped lugs, and I will add huge selection exists out in world so just not limited to these 5 styles ! Just my opinion that the combinations ,lug + seat surface which are curved maybe the cullpret - slight mismatch of a close ,but no cigar situation , maybe yours , that "never really get/stay tight after properly torqued ! This easy test can reveal those , but may also "shed light" on the "Flat and the"Mag" types too. Anti-seize is fully coated ,thinly on lug and the wheel seat ,then push the lug into an "unmounted wheel" hole- make steady pressure and pull away from wheel and examine lug mating suface vs wheel "seat surfaces" and do like with "Plastigage" that measures bearing clearance/abnornal fit of engine's bearing fit. A nice squished out antisieze - leaving just trace of a film ,I'd say they are an intended "mate" , but if a heavier area of antisieze remains probably means not a matching "contour" and torquing that situation likely gets looser & looser on it's own .Lastly universal rule on whl. lugs/studs = lug & stud threads NO LUBE ! Brakeleen even ,then clean & dry ,wirebrush even ; Lug "mating surface & wheel hole's concave mating surface MAY have light film of antisieze so asnot to "gall" , also alleviates that three stooges sound effect of nails pulling out of a coffin , & eases removal , stopped w/flat .
Glen 11/9/2017