I use Amsoil cvt fluid in my accord and will continue to do so.If the Castrol is working for you, I would stick with it. I've used Castrol and Valvoline in a high mileage ex-Hertz Altima with excellent results. It was black as night when I started; after 5 spill-and-fills, 100K more miles (180K now) it is doing great.
The Castrol cvt fluid is getting harder to find so may have to eventually go to the Castrol atf/cvt universal fluid for her car.