Try the deck interview thing when accuracy drops. Just ask your deck directly: ‘What are you best at predicting?’ ‘What timeframes work for you?’ and ‘How do you show yes/no?’
Different decks have different personalities. My Rider-Waite is good with career stuff, but my Crow Tarot works better for relationship timing. Matching the deck to the question type helps with accuracy.
Usually if there are mistakes in the reading it’s because of the readers and not the cards. I don’t blame my tools when I can’t understand a reading and that’s exactly why Tarot journaling is so good because it will let you see what you missed the first time so you don’t keep making the same mistakes reading spreads.