Edge 820 custom data fields

Ok - new 820 arrived (at the £141 price available tail end of last week) - it's replacing my aging, but still working 800.
So, new toy - I could just configure the same data fields I used on my 800, but where's the fun in that ...
Suggestions then, please - with the IQ connect store - any particular datafields/widgets that you've found useful whilst riding? Or are the pretty much all superfluous and I'd be best to stick to inbuilt fields?
One thing I did notice - 30 minute ride in this morning - 12% battery drain - er ... possibly because the backlight seemed to be on a lot, possibly because I've loaded a load of IQ datafields and got them all on one activity profile ... just testing
So, new toy - I could just configure the same data fields I used on my 800, but where's the fun in that ...
Suggestions then, please - with the IQ connect store - any particular datafields/widgets that you've found useful whilst riding? Or are the pretty much all superfluous and I'd be best to stick to inbuilt fields?
One thing I did notice - 30 minute ride in this morning - 12% battery drain - er ... possibly because the backlight seemed to be on a lot, possibly because I've loaded a load of IQ datafields and got them all on one activity profile ... just testing

0
Posts
With that said... What's my ftp is pretty neat - https://apps.garmin.com/en-IE/apps/a947 ... 57fc369dbb
(presuming you have a power meter! - if you do, and you sign up to Xert they have lots of other clever datafields).
I do have a powermeter, but not on my everyday bike - I reserve that for my TT or summer road bike ... so I'll be looking for a sensible display for TT mode too.
sadly, in the pursuit of a clever interface, they've muddled the waters somewhat.
I was trying to turn off one of the data screens - click settings/activity profile/data screen/screen3 - enabled off - tick tick - still enabled ... hmm ... ok - it's a small flick switch - could be me miss hitting - tried several times - nope - could be the custom data field - nope ... ah - ok, you edit the screen, enabled off then click the cross !! how bluddy stupid - every other setting you press the tick to save ...