I replied to your previous thread, but didn't get a response from you.
This thread is much the same, you have some basic assumptions that are both wrong and biased for no aparent reason.
Your focus on Low Deflection, makes you not focus on the more important aspects.
31" length, 14" pro taper and 12mm or smaller, that's gonna be whippy as f**k any way you slice it. If the ferrule material is XTC, Juma or Elforyn, sure have an impact on the final product, but not in the way you seem to think.
I could be wrong, but to me it sounds like you just need to try more equipment and not focus too much on all the technical stuff, see what you actually like playing with. Ask friends and other players to try their cues and see where that gets you.
Shaft diameter is a personal thing, but from my experiece, the popularity of small diameter shafts like OB2+ and Z3 have gone way down the last few years. Lots of people where initially hypnotized by the "bigger" cueball sensation you had when playing with small diameter shafts, but the small margin of error you get, means that your level of play most likely will vary more from time to time, most people find that frustrating in the end, and go back to something between 12.5 - 13mm. Allmost all the players I can think of that now play with small diameter shafts, are female, they usually have smaller hands and a 12.5mm shaft is often too thick for the ones that use a closed bridge.