Sensor mounting is BEFORE the control loop.
VBar Phasing setting/turn swash is AFTER the control loop.
So using "turn swash" to set phasing because of a mis-aligned sensor isn't really a good thing.
Just think of it logically, "sorry, Mr Spock Mel speaking",
Sensor alignment causes interaction, so in a pure elevator movement you get interaction on aileron axis, and since the control loop is different for those on the VBar, running the aileron control loop for elevator stuff isn't good.
Phasing issues in general;
I made a simple video in Phoenix last week to simulate bad phasing issue in both direction, and how to spot it.
Watch at YouTube
As you can see easiest way to spot it is that tail goes out of line on a half flip, but to come back on the second half.
Your best friend when mounting a sensor to get it straight? My 2 1/2 year's son's Lego box, I build lego pieces to make "a something" that I can use as 90 degree check.
It can be a single piece of lego (on my Logos) just to put between frame and sensor, or it can be a fork looking piece that has a arm that aligns with the frame on the outside, anything is possible.
Yes, turning the swash for 45 degree mixing is just what this function is for also.
Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more