You know though, I’ve been thinking about latency a lot lately and thinking that it might be better to just run everything through and external mixer and then come out of the mixer to your computer with Ableton. You couldn’t be able to use any of the Ableton effects but you wouldn’t have any latency since Ableton would be come a “back end” looper if that makes sense. I’ll be thinking on that.

I am using a Novation Nio right now, usb2 which has a bit too much latency for best live looping using the Looper

Just got A8…looking also to get the 1010 for looping(used to have one years ago for guitar rack unit control…yeah it’s a pain to set up but works great)

I set up my axiom 25 transport exactly the same as you have, but I’ve also reprogrammed the sustain pedal as follows:
Ctrl assign: 147
Data 1: 9
Data 2: 127
Data 3: 0
Assign the pedal to launch selected scene |>
Preferences: Select next scene on launch : [ON]

Now every time you press the pedal it will fire the scene and move to the next.