I have a set of the gorilla lugs for my methods. Not sure if they will work on the stockers since the acorn is narrow.
Another reason I may be having issues with the stock lugs is because they are 21mm (just found this out), and I have been using a 13/16"
nothing is standard sizing anymore, everything is metric these days. using a 13/16" in place of a 21mm will round those lugs off in no time.
to answer your question, the stock wheels are hub-centric. this means that the center of the wheel fits snugly on the hub, centering the wheel. the stock lug nuts have flat flanges on them that basically just hold the wheel to the hub.
those conical splined lug nuts you're talking about are meant mostly for aftermarket wheels because when you buy an aftermarket wheel it may or may not have a hub opening that will fit your truck's hub perfectly.
the solution for aftermarket wheels is to have the tapered stud holes that will accept the "tapered" conical lug nuts which will in turn, center your wheel on the hub when the lugs are seated. this is called lug-centric.
the lug nuts are made for two different reasons, so while the splined lug nuts might fit your stock wheels, they're not really made to and there's no reason to even question it.
get yourself a 21mm and you're good to go.
