I think your baselines on the 2013+ years is off. Brand new I believe my car (#14302) would have about 62 Ah, definitely not 75 Ah. It's still just a 24kwh pack but the 75Ah is for the 30kwh packs (most 2016s and all 2017s).
I also might not be able to contribute much in the future. My bluetooth ODB2 dongle likes to randomly disconnect while driving and not reconnect and the past few days that's been happening after I've been driving for a few minutes. I'm not sure if it's just loose or if something is wrong with it but it's far from consistently connected.
Here's some past data if you want it. It's not the whole set of LeafSpy data but it's the main things that were important to me at the time.
Date Mileage Ahr SOH Hx QC L1/L2
2017-01-05 22167 59.44 95 91.6 2 1024
2017-04-12 24938 59.49 95 91.69 2 1263
2017-04-21 25246 58.62 94 90.47 2 1286
2017-05-10 25784 58.21 93 89.37 2 1324
2017-05-20 26052 58.08 93 89.17 2 1344
2017-06-05 26534 58.18 93 89.37 2 1372
2017-06-13 26758 58.28 93 89.6 2 1384
2017-06-19 26925 58.52 94 90.09 2 1392
2017-06-28 27101 58.49 94 90.03 2 1402
2017-07-06 27159 58.58 94 90.19 2 1406
2017-07-16 27458 58.92 94 90.75 2 1427
2017-07-21 27680 59.05 95 90.97 2 1439
2017-07-24 27720 59.16 95 91.15 2 1443
2017-08-03 28066 59.08 95 91.01 2 1463
2017-08-07 28170 59.12 95 91.08 2 1469
2017-08-09 28246 58.95 94 90.8 2 1474
2017-08-15 28409 58.81 94 90.57 2 1482
2017-08-25 28665 58.96 94 90.81 2 1498
2017-08-28 28735 58.14 93 89.31 2 1502
2017-09-05 28960 57.74 92 88.47 2 1514
2017-09-08 29070 57.83 93 88.65 2 1520
2017-09-11 29109 57.65 92 88.28 2 1522
2017-09-18 29342 57.38 92 87.85 2 1534
2017-09-19 29361 57.47 92 87.92 2 1536
2017-09-25 29518 57.52 92 88.01 2 1544