I haven't been following the 30kwh pack discussions as closely as I have others, but it appears that this pack is more like the 2011-3/2013 24kwh packs in that it degrades quickly in hot temps, more slowly but still significantly in mild climates, and slowly only in very cool/cold climates. There also seems to be at least one degrading quickly in a cool climate. I suggest you run LeafSpy on your car, to see how it is doing.
I empathize with your quest for a car that has the features you need. I'm about to give up, because for me it comes down to getting a 2018 SL and getting cloth seats for it, or getting a 2018 SV without the Around View I have become dependent on using. That would be a nonstarter for a car with a low residual, if I had any sense...
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.