Yeah, I know what you mean. I've had many times when I put some real effort into copping a particular tone - then just when you think you've got it - you listen to the orig and - nope, somethings still not right.

Studio recordings are done with sophisticated equipment, overdubs, and unlimited post-production EQ. Tough sometimes. I've tried for years to get the "perfect" tones from (for example) Def Lep's Pyromania ( a Mutt Lange production masterpiece) - Finally have to settle for a sound that is convincing and has the elements of the tones - even though, side-by-side, it's definitely not "spot on". I'm not particularly good at it and it was almost a relief when I came to terms with the notion of just getting it in the ball park.

Our "quest for tone" can be a futile battle. All you can do is keep tweaking and come as close as you can. Have fun with it and good luck.