Fixture definition looks correct. This is (unfortunately) how FLX handles "pixel"-devices right now. You have to go through all 18 color-pages for accessing every LED. Additionally FLX-effects (like rainbow, chaser, ...) can not be applied.
If you need access to every single LED you have to assign every LED to one fader, which will take 12 (or more, if you want dimmer, strobe, ...) DMX channels. Patching is tricky, and for 4 devices you would need 48 faders. Maybe you should use same DMX-address for all 4 devices. Will need less faders (12, 14), but of course all devices will do the same.
Maybe try using a more "powerful" mode of your devices, with less DMX-channels, and using more of built-in-macros of your device. Can also result in nice effects.
If needed, I could answer in German, too.
Hth,
Kay.
Btw, this is only experience of a new user, so if this is not correct, please forgive me 😉