There is no need to pamper it. My experience is that LEAF Spy numbers drop when I drive the 2015 gently on suburban streets and do partial charges. The numbers increase back to normal (with slow decline over long time period) when I return to my normal freeway driving with deep discharge and 100% L2 overnight charging. The 2011 was just a steady (much more rapid) decline over time (both original and replacement batteries). DCQC also improves numbers and increases the actual energy the 2015 battery will store (as measured by revenue accuracy meter on input to EVSE). My guess is that you have some permanent battery deterioration due to temperature and time and some additional indicated deterioration (low LEAF Spy numbers) due to frequent short charges, shallow discharges, and short surface street test drives by the dealer and possible customers. Your LEAF Spy numbers should improve with normal daily driving and overnight L2 charging. Try to discharge to VLBW (very low battery warning with --- indicated for remaining range) before an overnight charge once in a while to give the LBC (lithium battery controller, also called BMS for battery management system) a chance to learn the current battery capacity. Occaisional DCQCs would be good if you have convenient access to chargers. Don't be afraid to charge to 100% overnight if you are driving it every day. If you are going to park it for more than a day or two, try to park with 70% SOC or less. It sounds like a nice car and it should serve you well unless you need absolute maximum range of a new battery.
As a comparison, here are my Leaf Spy numbers from last night: AHr=46.29, SOH=74.54%, Hx=52.49%, QC=125, L1/L2=871, and odometer=53,808 miles. My car has been charged to 100% nearly every charge cycle and spent its entire life in Phoenix, AZ. The original battery has lost 2 capacity bars, but this is much better than the 2011 which was down to 8 capacity bars and had the original battery replaced after 27 months of use. The replacement battery had been down to 11 bars for a while by the time of the crash after a total of 42 months and 50,422 miles (15 months and about 15,000 miles on the replacement battery).
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019