I did the .602 SBF and took the .605 update and my phone is just flying. I don't even use the stock keyboard. Maybe I am wrong but I think my issues started with using the TBH leak. Maybe I did something wrong but whatever it was, the official OTA is great, for me. I used Motorola One Click and it was as easy as Z4.
Also could be that I went with unistalling all the bloat - I mean all. All the Blur .apks and others. Also did clean installs of all the apps.
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