Welcome to the club
I'm hoping to own a Plus in a few more years...
1. Will charging from ~62% nightly be very bad for the battery pack?
2. I wish Nissan had sprung for water cooling the batteries, will this be a big issue in the southern heat?
3. Any other suggestions?
I assume you are asking if charging from 62% SOC to 100% SOC will be bad for the battery. Any charging to 100% SOC, especially in heat, isn't good for the battery if you do it frequently. I would suggest instead that you try to keep the pack between 20% - 80% SOC most of the time, unless you need the extra range.
The jury is still out on the new 62 kWh packs, but I would guess it's highly unlikely that your LEAF will fair any better than older LEAFs in hot climates. The 2015 pack has so far been the best one Nissan ever produced,
One thing in your favor though, with a bigger pack, is that you will less often do deep discharges compared to owners of 24 kWh packs. If you avoid charging to 100% when it's hot and only charge overnight when it's cooler then that's about the best you can do.
Vancouver, CA owner of a 2013 Ocean Blue SV + QC, purchased 01/2017 in WA
Zencar 12/20/24/30A L1/L2 portable EVSE
1-1/4" Curt #11396 hitch
After market, DIY LED DRLs
LeafSpy Pro + Konnwei KW902 ELM327 BT OBDII dongle
Loving my first BEV