I will post this link here:
http://www.badmuckingfastard.com/sound/slipperman.html
For the simple reason that the "commercial profilers" know how to do it(hope so) and all of them do it in their own (professional) recording studio.This link with the "rules of recording electric guitar" is afaik a "new standard",posted in many blogs and the writer is a well known producer who owns a very well known recording studio in the east coast of the USA.
Who ever wants to make his own profiles but is not the super expirienced professional should read this.It is funny too.But more so very informative.Even if you cant do it exactly like "Slipperman" be sure that even if you follow only the most important rules your profiles will get better.Maybe one further step to improve the profiles in the "rig exchange".