You shouldn't have flashed that custom rom. Now you have to wait for the full sbf to be leaked which could take weeks or months. By flashing the custom rom, you overwrote /system.
If you didn't do that, you could have simply flashed the boot.img from the 4.4.4 OTA file.
Your only other option is to find someone with the same variant as you have on 4.4.4 and ask them to do a twrp backup of just system and boot. Then flash that backup.
Remember: you can't downgrade without great risk of bricking - either immediately or in the future.
so how should i proceed?! this time i want to be sure
to use my moto in the past days, i flashed kripton rom! so should i just restore from recovery the backup (after a factory reset)?
thanks a lot!!