Ok hopefully these help.

Uploaded 4 videos 1 for each side, um sorry about the shorts, won't be using those outside anymore apart from with thermals over the top!

Hope they are clear enough.
Next video


Next Video


Last Video


Here is a video from 9 years ago in TT position, thought it may be of use as you can see my position then.


And thus one

https://youtu.be/z8bEfBAnA3g



Ive looked at my videos and also after watching a video on saddle height on Cam Nicholls YouTube channel it would seem I'm "snatching" at the bottom which would suggest maybe my saddle is indeed too high ?

Questions with that is why have I never had any instability like this in the past despite having up to 74.5cm saddle height rather than the 73 it's at now and how would a reputable bike fitter not identify this?

Also when I tried those shorter cranks as mentioned the effect of half a cm saddle difference was crippling me on a 4% incline wobbling all over and no power.

Should I try 1cm lower on the turbo?
Should I try widening stance with the 2mm extenders?