mcrumble69's dashboard

My issues were not due to flex. Though I do experience what you mention with certain skewers.
My issue was due to large tires.
When tuned-aligned correctly with larger tires,the derailleur cage was too close to the side knobs on the tire and would rub.
When I angled the cage away from the tire enough to clear, The chain line was way off and would rub the cage.

The wider BB cured this problem because It spaced the granny ring further away from the BB shell allowing me to also space the derailleur cage out away from the tire.

This was not an issue with 2.3 or smaller tires.

Hey skellz did you get this sorted?
If not I'm using a similar FD.
It worked BUT due to the cage length, I did have tire clearance issues.
To cure this you can space the drive side crank arm out further,or if you are using an older style ISIS BB you could run a longer axle BB (for example 118 instead of 113) and tune the FD outboard just enough to clear the tire.

I'm not positive if this will work with a 3 ring setup,but it works for me with a dual ring-bash setup and a 2.4 tire.

You could also look into a Shimano SLX FD. They are available with a shorter cage.

I agree..I'd like to see a monochromatic San An with a lower BB.and lower overall stand over height.
Those were the only things holding me back from buying one : )