That's a nice training regimen. I'm not sure what you mean by "mastering" a joseki, though. I assume you mean mastering a particular joseki variation. I have a couple ideas, though being only 4k on KGS, they might not be useful for your studies ... just my two cents.
In terms of joseki study, I've always believed that the joseki to study at a given point should be related to the style of game you intend (or expect) to play. For me, this is largely dictated by the opening that I choose to play. Perhaps, as a stronger player, you are more flexible in your fuseki, but the same principle applies, I think.
In terms of which joseki to learn, I would suggest one "simpler" joseki variation and one "complicated" joseki variation. For instance, you could pick the following two variations to study for one week (if you don't know them already; also, if my "joseki" are wrong, I apologize ... I'm only learning these myself
):I chose these two because they both begin with pincers that I am likely to see in my own games (well, the second one will show up only if I'm the White player ... it's a fun variation, but not many know it at my level).
Anyways, the reason I suggest one simple and one complicated is to allow yourself the opportunity to study some of the more complicated variations of certain joseki (Magic Sword, Taisha, Avalanche, etc.) but still continue to study joseki that allows you to simplify the game early on, if you find yourself in a position to do so.
I see too many players at my level who are studying the most complicated joseki they can find without considering the simple plays. Perhaps, at your level, that's no longer the case.
Either way, good luck with your studies! Above all, make sure you're having fun!
