I've been learning to decode cw for a while now, mainly by using the Word training feature of https://lcwo.net . I use this rather than the exercises with random characters, both because it's more fun to hear words and because a hand injury makes it hard to type fast enough.
I've heard that it's good to learn at a "high" speed, like 20 wpm to get the feel for how each symbol sounds rather than counting dits and dah's. Now here's the thing: I find the easiest speed to hear is somewhere at 30+ wpm, while the 20 wpm words are harder by comparison! At 20 wpm, I hear dits and dah's, and I just can't "hear" the separate units as easily.
My question is: Should I try to practice more at the slower 20 wpm, or can i just go on practicing at becoming more confident at 30+ wpm, and hope the slower speed will come naturally later?
I can't decode longer texts at 30 wpm without longer spaces between the words, but I know it's common to learn with letters at high speed with gaps between them, and maybe this could be effective by a similar logic... ?
Many guides give warnings like "5 wpm and 20 wpm are different skills, so learn the right one". I find nothing on my problem, but I worry slightly I might be doing work I'll have to redo later.