I have found that if I repeatedly ask the same question, it's like the spirits are annoyed and then I start to get weird readings. If I do a single reading or a second as a confirmation, they almost always match energetically, even if the cards are slightly different.

I use the natal chart, transits and progressions for myself and then the cards for clarity on a certain situation.

I have also found that I have almost 100% accuracy with one deck (for me it is the Vision Quest tarot), but less success with a few other decks that do not resonate with me.