Map Vacuum | O2 Readings - What's Normal?

Afternoon,

Recently went ahead and got myself TuneECU to see if I can get to the bottom of my off throttle blues. Issue is when coming to a stop my revs drop below idle and will even cut out at times (especially when cold). I recorded some data with TECU and wondered if anyone knows if this is normal.

Firstly at idle doing nothing my MAP sensor reads around 370-390hpa. Both cylinders seem to be in line with one another (MAP 1 and MAP 2 reading 370). Is this a normal reading?

Coming off throttle (0% TPS), my MAP reading can go from (as an example) 560hpa down to 320hpa very quickly, even as low as 230hpa, and my revs can dip as low as 890 (target idle is 1000). Is that MAP reading normal for closing the TPS to 0%?

I also took some readings of my O2 sensors, I'm not sure what normal looks like. I do recall reading that anything over 75% + or - isn't great.

Oxygen Sensor 1 Range - Off Idle | -54.7%
Oxygen Sensor 1 Range - Idle | -69.5%
Oxygen Sensor 1 Status - Off Idle | -0.8%
Oxygen Sensor 1 Status - Idle | -0.8%
Oxygen Sensor 2 Range - Off Idle | -73.4%
Oxygen Sensor 2 Range - Idle | -95.3%
Oxygen Sensor 2 Status - Off Idle | -0.8%
Oxygen Sensor 2 Status - Idle | -0.0%

Did some more looking after posting. Seems to be the case anything over 75% indicates a fault. I have had the bike in the garage a few times now, but they haven't identified any real cause (no MIL) - no vacuum or air leaks, blockages, sparks OK, fueling OK. I recently had the MAP sensor replaced. I haven't had my valve clearances looked at yet. Am I looking at a faulty O2 sensor here?

Thanks.