From my observations I can only say that once razor rash or razor sets in on a girls pubic area she has to stop shaving for a while.
She'll have to let the skin heal, take care of the ingrown hairs and perhaps disinfect with an antiseptic.
The areas most susceptible to rash and burn are the mons (the pubic bone area) and the inner thighs; these are places where clothing rubs. The vulva seem surprisingly razor friendly.
My suggestion to you girls is to shave with a clean disinfected razor. Not necessarily a brand new one. Use lots of water with good shaving cream. Shave in the direction that does not rasp. Try to shave so that you do not have to go ten times over the same area. Rinse very well. Then apply a soothing after shave balm, like gillette balms; they don`t sting but they disinfect and soothe.
Also don`t shave your pubes every day. Shave them the morning before seeing your favourite regular. The rest of the clients can do with a little stubble.
As for waxing the pubes. If you have thick course hair. The waxing will rip the the skin. If you have sparse fine hair you have to wait till it grows enough to wax it. So you have a longer cycle of growth and freshly done.
As for laser or electrolysis. What do you think?