You obviously know what to do when you roll to the left, so its just a matter of reminding your brain to tell your fingers about it.

Maybe you need a shock to get everything going. Often we practice so much that we are just practicing our mistakes over and over. You might need to change something physical to get you to chage the way you roll. If you don't already use one, try switching to a tray for a few weeks, change the way you hold the sticks, maybe change the length of your sticks. These will serve as physical reminders about what your fingers are doing wrong.

Good luck