So I'm a member of both Porn Companions and Tryst Agency, but are there any other sites out there with pornstars who are providers? Or conversely does anybody have any recommendations for providers who aren't associated with an agency but still tour?

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The Pornstar board here is fairly active and has some contributors who seem pretty knowledgeable.

It's called "The Erotic Review."  
http://www.theeroticreview.com/reviews/newreviewsList.asp?searchreview=1&Pornstar=1&SortBy=3&gDistance=0

many of the "Porn stars" start out as providers and then make a few movies so they can charge more for the same services by advertising themselves as Porn stars.  

I should've expected a response like this.
I have obviously searched on here before but in reality there are far more providers/pornstars that are UTR than not. Thanks!

These guys can have their porn stars. I've had (and continue to have) great times with non-porn stars.

 
My impression is that these porn stars depend on the simple fact that they are (or have been) porn stars - in much the same way that some ladies charge more just based on looks and not performance.

 
Besides, I don't really know any modern-day porn stars so most of the names mean nothing to me.

It was less satisfying than the average Kgirl session.  She was the real deal (Jade Hsu) but she smoked during the session even after I told her I had a smoke allergy.  She mistakenly thought I came so hard that it brought tears to my eyes.  Lol