I'm also studying Russian. Are you using the Fluent Forever app along with the book? How are you storing your anki cards (anki app or something else).
I've used some spaced repetition/Anki stuff to put an initial dent in Portuguese. Compared to learning French the old fashioned way of practice with humans and repetition; it's a huge basket of fail for me. Virtually no useful results. Stopped with Anki, moved to Portugal; zero lessons, but making some attempts with the locals with a shitty phrasebook and dictionary -I actually got decent results. Maybe you can call that "spaced repetition." In which case everything is spaced repetition.
I believe people can remember lots of facts via flashcards, as I've done this myself in the past. I'm not so sure it works on languages.
The only advice that I find a bit rushed is to read books with the audio after you learn the top 1.000 words and half of your grammar book. That's still too hard for me.
But I can listen to this Russian-only podcast and undertand almost everything: https://russianpodcast.eu