PC Rules

I conducted a test which compared playing an LP, and listening to the same LP on PC playback. The PC play back was a clear winner, it was equivalent to a cartridge upgrade. I attribute this to my rebuilt vinyl computer interface.

After buying a new interface, I removed and replaced all of the capacitors with superior caps; this would be the same as having a superior phono pre between you and the computer.

If you're not getting the same results, don't blame it on the computer.
The original recording is those "squigly" things on black vinyl. The quality of the components between those "squigly" things and your ear determine how good the sound is. Each time the signal goes from one stage to the next, a new signal is born; consequently, by the time it gets to your ear, it has been reborn many times.
Unless your squigly things generates some sort of immaculate conception the rebirth process must involve the passage of data from one generation to the next. The issue then becomes whether that data is passed unaltered, or does some distortion creep in?

BTW, none of this will matter after 8:11pm.
isn't this really about the sonic signature of whatever DAC is being used? perhaps the OP simply prefers his DAC's sound over the 'un-digitized' version. when I make CDs of my LPs, there's a noticeable increase in the bass, and the amount of increase is different depending on whether I'm playing through my CDP or through a different CDP using a DAC.
So if your theory is correct you should be able to loop the recording through your PC and continuously improve the sound on each loop? This is a fantastic breakthrough that could be the sonic equivalent of perpetual motion. My hat is off to you sir!
I'm guessing you must really like the new coloration you receive from your computer A/D-D/A, and whatever else involved, in comparison to the original source.