the conjugation thing is really interesting and you're right you should just plow through with mistakes, even knowingly.

One thing you notice in kids in their native language is they get the trickier/irregular parts of grammar wrong all the time and repeatedly, as in they are corrected but just carry on making the mistake, I guess until one day finally the right pattern gets learned through sheer brute force of repetition. In the meantime, they're perfectly well understood by everyone anyway.

Obviously as an adult you can somewhat shortcut this because of better understanding of grammar and knowing how to learn, and being quicker to absorb and make the changes, but regardless I think the basic premise still applies - you learn the right way over time just by doing it over and over and over until you can't not remember it is the right way.

And, to be honest, if the wrong way is understood, how practically wrong really is it? (you will always always have tells you are not a native speaker no matter what, some of these can even be charming, I don't know if it should even be a goal to get this to zero at all).