Hi, thanks for the nice words

Nexto 2730 has ExFat now after firmware update and accepts files heavier than 4GB without any problems. When i bought it it didnt have this feature so it was very problematic to use, now it is brilliant
Copying 64GB komputerbay 1000x card takes about 8-10 minutes in "fast copy" mode, you can also use "copy and verify" option - it would take two times longer. It doesnt have "format card" option, you can only format internal HDD as exfat. To keep exfat on CF card i dont use in camera format (fat only) but the file manager and just deleting all files from there.
I didnt use ND filter at all, only circular polarizer (it also lowers exposition about 2 stops).