For the 20 lessons/day thing you can also spread out the kanji to make life easier. Since you’re waiting on getting radicals to guru anyway I found it easier to limit myself to 10 kanji/day for max speed levels and doing an extra 5 lessons in the second half of the level to keep up with vocab for the pace.
Personally, I’ve switched to a roughly 10 day/level schedule that’s around 15 lessons/day and it has let me drop to 5 kanji/day without much trouble so far.
Most of the apps have good lesson filters built in, and it’s much easier to toss in a 10-20 item review over a lunch break when following a daily routine like this. If you’re strictly on PC I’d recommend checking out this script as well.