Haha, glad it helped you! I would never done WK at full speed if I was to not review items after lessons by myself (without WK’s SRS). I’d definitely get at least half the kanji wrong in the 4h SRS interval.
I think the trick is to add a good amount of repetition around the time you learn something new (reinforcement of the short-term memory), and then let SRS do its thing (for the long-term memory).