There is a trade-off between the time to make a card and the relative benefit of having more spread out cards.

In that case I still don't see why you don't decide for either the one letter code or the fullname.

Wozniaks idea is that if you use different way to get to the answer then you won't strenghen you memory in the same way as when you always use the same way to answer a card.

That means the algortihm won't correctly calculate the time you need to repeat the card because it doesn't know whether which answer you gave to the card. That in turn leads to forgotten cards which is bad because you need to start again with them.

Can you link to some of your cards so we can get a sense of how you've made them?

I haven't taken care of keeping out copyrighted pictures and sorted my cards decently. There's also a mix of languages. So at the moment I have nothing that easily publishable as a collection. Maybe I will in the future.