If the thread is too tight, it could split the shaft. Say if it is in a dryer area than where it was made. If you have had the cue a long time, the risk is probably low.
I use Trewax brand wax. Works well and has a nice natural smell. (Carnauba).
Would not use pledge furniture polish, it is oil based and may have silicone in it. They do make a pledge paste wax if that is what you refer to. Never tried or smelled it.
Beeswax also works, but is more difficult to apply, especially in a thin coat. An un-mushed lump or build up is hard enough to possibly cause a mechanical problem, if you don't apply thinly only to the screw, or dissolve it before use.
Other brands of pastewax work, but stink, like Johnsons, or Butcher's wax
I don't think Minwax is a good product, (gummy) and it also smells bad.
If thin paste wax does not make a significant difference, you may need to have the cue re-tapped by the maker.
smt
PS, I hate to argue with people methods that work. But as a carpenter i always avoided soap such as ivory, because it is hygroscopic (draws moisture out of the air) and rusts fasteners. I do realize pins are stainless.
