My suggestion is to get comfortable, rather than worry about whether log(x) = log
on how you're holding the horn. Not clear to me that it makes a big difference unless you've got it upside down.
after receiving instructions and having tried what should be working, if it doesn't work for you, and you prefer doing something else ...do it.
Yes...and yes. I mean, quite seriously...does any alto player really play with the mouthpiece heading straight in, level ? Not most of whom I have seen. The neck of an Alto is the neck of an alto...if this were the intention of the instrument (or I should say if this were an utmost critical factor), then the neck of the Alto would have a different curvature. Matter of fact, the angle is often different on a modern neck than most older ones.
Certainly you don't wanna get into 'clarinet angle' because as has been correctly mentioned ad infinitum here...in MOST instances that's um, wrong. Blowing across vs. blowing "through", etc.
I think we have some over-thinking going on here...I mean, when we get people saying that the "correct" distance to hold the sax is this or that....the conversation sorta starts spinning away because, obviously, anyone can dig up a plethora of examples from great players which seems to contradict this. There's a guy holding the horn this way...sounds great. There's a girl holding the horn that way...sounds great.....
Your opening comment seems to indicate you are becoming more pleased with your sound...and the thing which is bothering you is that the mouthpiece angle in doesn't seem to be 'right'.
I guess...I would go back to Saxmusicguy's question...which probably should have been asked earlier in the thread:
What, specifically is your problem/issue/displeasure with your current tone/sound ? Or is it not tone at all...but something else (phrasing difficulty, attack, mouth fatigue, feeling of unnaturalness, etc) ?
Followup Q would be....is this then coming from the angle of mouthpiece into mouth, or from something else ?