Reddit reviews SCHOOL OF ADVANCED PIANO PLAYING (EXERCISES)
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Take a look at these: this and this. I have a relative who minored in piano in college and who sent me the latter book. Checked and it is still published. Intend to jump into it when I finish my current method book in about 2 months.
Because I am two months away from your point, I would be interested in answers from others too.
EDIT: Forgot to add this series that I found awhile ago. Books 7, 8, and/or 9 might be good as a continuation.