Regarding the chromatic passing tone over a dominant chord leading to the root of the next chord change, I could post a large and potentially annoying couple of paragraphs about chromatic passing tones and approach tones, but in the end it comes down to this:
If it was good enough for Ray Brown/Ron Carter/Sam Jones/Paul Chambers/Percy Heath/Rufus Reid/Christian McBride among many, many others, it is certainly good enough for me.

I learned to build lines from imitating these players because what they played on all of these great records sounded great to me.
I teach music theory for a living both in the classical and jazz spheres (and both paradigms of harmony and melodic harmonic relation are amazingly similar). One thing I try to tell my classes early and often is that the music always comes first. The theory comes later as somebody's attempt to put a label or explanation on an iconic sound that was already in practice by the composers/improvisers of the day. These original creators of the music-thateventually-became-codified were writing and playing sounds not because they were "correct" according to a book, but because the sounds in question sounded good and right to them in the context of the music they were making.
For this reason, in my opinion we should always try to put the music first. Don't start by asking if something is correct; rather, start by asking yourself if it sounds good to you. If it doesn't, don't play it unless/until you reach a point where it does sound good. If it already sounds good to you, then play it until it no longer does, then replace it with something you feel sounds better. IMO, that's what great musicians do.
As far as "what not to do on walking lines", a couple of things come to mind:
-
Don't let worrying about finding the "correct" note ever interfere with your time and groove. The right note at the wrong time is no longer the right note. The right note played with bad time is worse than a wrong note played with great time.
- Don't spend so much time arguing with strangers on the internet about note choices that you no longer have time to practice. Life - and practice time - is too short.
