If you do the 9.88 route, then pause and unpause frame perfectly either on the frame you let go of right or the frame after, you'll get a 9.84. If you're slow by a frame you get a 9.86

https://twitter.com/The8bitbeast/status/1212904145474080773

Update: You can do the pause a bit earlier. Anywhere from about halfway through holding right up until the frame you let go of right.

Double update: I made a video tutorial for this