Yeah - I am totally not your guy for deciphering circuits 
Hmm, from the sound of it, you love a big messy tone that you can control - between mentioning De Stijl (just listening to it yesterday, along with a few of the originals done by Son House and Blind Willie McTell), and such, you like a big squeal.
Okay - cool. You mention rolling off the Volume to clean up your signal - you get the principle of knob twiddling. You are just messing with a meat cleaver of a tone and I was giving suggestions related to fine-tuning a “finer blade” of tone. If you are targeting Jack White and have the gear to make it happen, then yeah, my knob twiddling will only influence the tone so much.
In terms of musically inefficient, really quickly: I am not a scientist or engineer, so this is my layman’s attempt to articulate it. Instruments that produce their tones mechanically - e.g., a flattop acoustic guitar via picking/strumming - are built in a way that reinforces some harmonic tones over the main note and dampens others. If you get a good example that reinforces good tones super well and dampens the clashy harmonics well, you get a guitar that is very musical sounding - you can build chords and the notes blend well and clash less. Cool?
Now go to digital. Early CD’s sounded awful because they could reproduce everything - you wanted some of the damping provided by analog recording - or, at least, you needed to re-master the CD version so it sounded more like an analog recording with its inherent damping.
Well, in a guitar circuit, you have Volume and Tone pots. These days, similar to the CD, components are being built better. If you take a generic pot that is supposed to work in any electronic circuit, when you twiddle it’s dial it is supposed to cut off any signal above its current setting - and modern pots are pretty darn good at that. Too good - they lop off everything tonally. Old pots didn’t have as fine of a cut-off line - there was a general decrease or increase, but some frequencies were dampened less and some were dampened more, given the materials used.
That “blurrier” cut-off line may be inefficient from an electronics-component standpoint, but it sounds more musical - it is a subtle thing. When I have spent time with modern guitars vs. ones with old components, it is NOT like drinking a fine wine vs. drinking crap and saying “oh, it’s obvious!” - it is more subtle. When you do bends, or grab a couple of strings and play a ZZ Top blues lick where you have notes rubbing up against each other (that cool lick in La Grange that they do right before they take it down to just drums again, for instance) - it just sounds…better. You sound better and you find yourself liking your playing more.
99% of the crap online, as Shakester points out regularly and correctly - is crap. 99% of the discussion of components is beyond crap. But the basic principle that some components sound better in a music circuit is true - but it can really vary based on the experience of the player, the tone they are going for (you really like wide-open, squealing tones - so a more tightly-controlled rock/crunch tone does you little good), etc…
How’s that? Shakester - I suspect you’ll have a comment or two. I have no clue about that Goya circuit - at the very least you would want to take a pic of your control cavity to share - not enough to go on from your description, even for me…