Have you tried the new scheduling algorithm FSRS in Anki? It would improve your experience with spaced repetition. It's also interesting how it will learn from your review logs of two years.
By default, Anki will aim for revision intervals/frequencies that give you a 90% chance of remembering each card correctly.
By default, Anki uses SM-2 algorithm, which doesn't aim for any retention level.
Have you tried the new scheduling algorithm FSRS in Anki? It would improve your experience with spaced repetition. It's also interesting how it will learn from your review logs of two years.