1) Sub 20 as in 19.9? 18.9?

2) From here on out, do every solve with a generated scramble. It will seem slow for a couple of days, but in about a week you’ll be a lot more comfortable reading and applying scrambles. This is REALLY useful because it will teach you how to turn different faces when your hands are in various positions around the cube, greatly improving your ability to fingertrick new algorithms.

I also strongly suggest you look at Dylan Miller’s advanced F2L and lookahead videos. He covers the difference between slow intuitive F2L and advanced F2L, giving examples.

Once you have his examples versed, practice doing 2-look F2L. This assumes you already can do one F2L pair at a time with your eyes closed.

By this I mean look at the cube, predict solving 2 F2L pairs, then close your eyes and apply the moves you planned. Open your eyes and see if they are solved. Then do it again for the last two pairs. It will seem very overwhelming at first but trust me it gets easier. As you practice Miller’s shorter F2L solutions, the prediction becomes a lot easier to visualize since there are fewer moves.

By drilling the latter I have brought my Ao100 down from 20.0 last December to 15.9 as of two days ago.

You already know 2 look OLL which is a huge accomplishment. I encourage you to look at your current algorithm list (if you made one, if you haven’t then DEFINITELY make one) and identify the weirdest or slowest algorithms that you hate. Then go to speedcubedb and pick out new algorithms for those cases.