First, a quick follow up to 8A. As you acquire familiarity with triads in all keys, the time you spend on each key as you go through the cycle is completely individual. You may only need one or two repetitions on C but a lot more on F#. Spend the time on the least familiar (the hard ones are not so difficult as just plain less familiar) ones until you are approximately (ok, F# is probably never going to be as familiar as C) equal in fluency through all keys (it goes without saying that all your work here is without using anything printed – we want the knowledge to be in you – fingers & brain – not on the page).
When you get to this point, play through the cycle playing each triad once (triplets): C E G-F A C-Bb D F-Eb G Bb- and so on. Start slow, and gradually crank it up. Then time yourself. A respectable time through all keys is around 8-9 seconds. See what difference different articulation makes (all slurred, a tongued, two and one, one and two) just for fun.
It takes a while the first time to build the triads in all keys into your DNA, but you may notice at some point that once you do this, your triad review session are going to be very efficient – you will be able to review a whole lot of stuff in a minute or two and never need a scrap of paper. And when you do encounter this material written down later (solos, etudes, excerpts), you are going to zip through it without ado. Slick.
OK, moving on. Repeat all of this with the minor triad: 1 b3 5.
That’s it. Go for it.