Nah ,it was mounted perfectly . And thermal paste was the same (i use mx4 all time)There must have been something else going on for you get 10c difference in cooling changing from Macho Rev A and NH-D15. Typically there is only 2-3c difference, sometimes not even that. Maybe Macho had a bad seat?
Thats normal improvement . D15 is double the price . And much bigger (Macho : 870g / D15 : 1320g ) . Macho was hot to touch ,and D15 was only warm . Not scientific but thats how i experienced.
There is only one advantage on Macho : TY147A is better then NF A15 at least to my ears .