If you'll be changing the Maf anyway you might as well do that and see if it makes any changes to fuel trims.

Maf sensor should be here tues or wed of next week

Sorry for the slow update.
I got the new Maf sensor Tuesday night. So i did some logging in town before changing it
Before
(https://drive.google.com/file/d/1P7uLioEd1aluSqYxnfKfkvewuUksglFg/view?usp=sharing)
After
(https://drive.google.com/file/d/1F0-n0PV_FdNlk4sUieRhfmnTVwLolh-e/view?usp=sharing)
It took some time but the fuel trims did eventually come way down and I think the fuel pressure increased by a few pounds as well.
This one is after about an hour on the drive home using same road I have been doing most of my data logging on.
(https://drive.google.com/file/d/1EPTpIeFx7HYfgQrzf0WXKXcF4qtsEH0Z/view?usp=sharing)
So far I like what I am seeing, I will probably pull some plugs on the weekend to confirm this.

Only had a quick look at the 3 files you shared but the last one does look a lot better, and I think if the readings stay the same that should be the last of your mixture error codes ./ MIL light problems.

There probably isn't much point in looking at plugs - The equivalence ratio reading is the actual mixture, so if you're looking at plugs in attempt to check mixture there's little point as we can already see that mixture has been correct. It does go lean (fully lean as in no fuelling at all) when you lift off the throttle at cruising speed because it's supposed to, but that won't affect plugs because there's no burning going on under those conditions. It does go rich when you put your foot down under boost conditions, again it's supposed to and even a carb would go rich at full throttle.

I'm pleased to read it seems changing the MAF has delivered positive results.

Hope it stays the same! If it does stay good for the next few months it would be interesting to see if the old symptoms returned if you refitted the old MAF.

Ha ha refitting the old Maf... That's Brilliant! (not sarcasm) I glad I havent binned it yet. I will give it about a month and try that.
How long would you expect it to take the fuel trims to go crazy again?
It took the rush hour drive thru town and a few miles of cruise to see the results after replacing it. (Long enough for me to think I had just spent $450 for nothing)
The real test will come in fall when it gets colder and the air gets denser. But we may still get some cold spells yet. I did have the Mil pop up over the weekend before I got the new Maf.
I wish I had actually calculated my fuel mileage before changing the Maf, to see if it actually changed. Im not sure how the readout actually calculates it and how accurate they are, time will tell I guess.
I am a little disappointed though, I drove an hour+ one way, paid Land Rover dollars and was then handed a Denso Maf sensor. Which I could have purchased locally for half
the cost.
Oh well c'est la vie

One more dumb question.
Short of actually drilling a hole in my exhaust, what should keep an eye on to see if the small exhaust leaks (in previous pics) are actually starting to cause trouble? ( Im assuming Lfts and equivalence ratios)
I plan on repairing them but would like to wait until winter when Im not driving the truck.

UPDATE:
The truck has been running great, no Mil light.
Data log from last wed with the new Maf sensor.
https://drive.google.com/file/d/12HHfxZqBgnBm-A1zdWrmOHUCM-p15tYJ/view?usp=sharing

I installed the old sensor for a few days as requested and the LFTs seemed to become somewhat inconsistent, Friday they were high around 10, Sunday they were only slightly above normal and today they went up to 11-13 during cruise. Interestingly they never got as high as they were before the sensor was replaced. Which could be just not enough mileage yet. It does not seem to have proper throttle response with the old sensor. It feels slightly lame at times usually when passing cars. It feels like it takes more throttle to make things happen. But that could also just be in my head.
I do have some data logs if you want to see them. I will be reinstalling the new sensor tonight.