I feel PTSD. But I did.
When I have trouble memorizing, I go back and see if I'm covering all my bases...-intellectual memory (finding anchor points and making sense of chords and stuff, which you said you've done)-muscle memory-visual memory (this one is hard but REALLY useful) - can you picture the sheet music in your head, to the degree you could write it down? That's how I have gotten through weird Rachmaninoff music!-aural memory (hearing the tune in your head)
especially Im finding that Scriabin for example not uses so many standard chords.