I would give it a few tanks to see what the error for the trip meter works out to be. Fuel pumps aren't very consistent. The error rates for my vehicles are:
1.4% - 2005 Prius
3.6% - 2009 Prius
4.8% - 2011 BMW R1200RT
6.5% - 2014 VW Sportwagen TDI
The VW is only an average of 4 tanks and so far they vary from 5.5% to 8.0%.
I would not add an additional transmission cooler. If you are concerned about the CVT I would change the fluid more frequently than the 60K miles recommended by Nissan.
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