"Statistically speaking it is highly unlikely that every single file I tried has bad RGB values and that that is related to me."
Statistically and otherwise. Since, so far, you've been relying on your in camera meter to properly expose your images, this could be a problem. Many digital camera light meters purposefully underexpose the image in an attempt to retain as much highlight detail as possible. They do this because it's generally a lot easier to extract shadow detail than pull in highlights that are blown. Sort of a safety factor, if you will. So, yes, it's very possible that many or most of your shots look underexposed directly out of the camera.
In addition, every profile for every paper incorporates an assumed light viewing condition for the resulting prints. That viewing condition is usually some sort of standardized, color corrected and luminance corrected specification. You can look them up if you want, but I don't have them off the top of my head. A lot of us use lights like the Solux tungsten 4700Kelvin lights or the equivalent. When you're viewing your prints under random room light, that viewing light is very likely not anywhere near the spec for viewing that the paper profiles were made under. This could make your prints appear lighter than normal, darker than normal, or, if you're lucky, approximately right.
But judging the situation after slogging through all these posts, it does seem like an overall exposure problem is at the root of your printer woes, particularly when you are saying that the test files are printing more or less right and your own files are not.
I may be mistaken, but I thought I saw in one of your posts that you were in Southern California. If that's true, I invite you to drop by my studio and we'll make a couple of test prints on my Epson 9900 which has been custom profile and view them on a reference calibrated monitor. Really, the only way to properly judge digital camera exposure is on a hardware calibrated screen in a color managed application. I could tell you a lot in a very few short minutes after seeing your files and making a couple of prints. The west side of L.A. awaits.
Peter