To be honest, many of the patterns I discerned exactly from long lists of verbs in their various conjugations I kept as a Google Doc .
Here’s a couple of threads from our forums here: 1, 2, 3, 4
Yup, makes sense! J->J seems like the optimal solution. I use J->E and a bit of psychological trickery by pronouncing the word in Japanese as I type the answer to the Anki card in English. That way I pull the emotional connection I have with the word in English and associate it with the sound in Japanese.