I have had the longer nismo ones 70mm? I am not quite sure on the length. I have had them for 5+years with no problems, i have volk te37's which fit tightly, also the 3/4" wheel spacers were custom made and fit very tightly. I use the open ended lightweight kyokugen magnesium lug nuts.
The only thing i had to do was spot weld the back of the studs in the rear to keep them from spinning in the hub while tightening, other than that 0 issues. I also usually tq my wheels to around 90 ft lbs, always by hand. The only thing i use an impact for is anything that i cant break loose by hand.
The washer method you were talking about is sketchy as hell my cousins 240sx loost a wheel like that.