There’s a thread on essential Clone Wars episodes. Here’s a link to my post. I tried to narrow it down as much as I could, but I really want add a few more episodes.
I have yet to view Lightsaber Lost. I’ve really come to enjoy Ahsoka’s character, so I’d be very interested to check that one out.
You basically nailed the essentials, but even non-essentials can add a bit to the over-arcing storyline, so I try to add them to the list, just as long as they’re not COMPLETELY dumb or pointless in my eyes (and there are more than a few that are so dumb, I can only exclaim, “why?!”).