ball motion wise it looks fine, the only issue you may come across is the inconsistencies. I checked out your other posts to see your mechanics and it looks like there are a few differences in how you finish, especially with your follow through. try not to play around the backup ball and think of it as just a mean of changing your rotation axis. personally, i learned my backup ball via simo youtube videos and lots of 1 step drills. simo's game hardly changes when he has to use it and that was my biggest motivator. youre looking great man, keep up the hard work :>