Thanks for the reply.
1. I figured out what I was doing wrong with my first question. For me personally, I can't push their hand into their stomach as you and Giles suggest. It was still a struggle for me to get the sweep. I was also still getting armbarred as people were still able to stand up to clear enough space for their legs to get thru for the armbar.
I have to really exaggerate putting the hand I have kimura'd into their far side pocket. I'm basically doing an arm drag with the kimura grip, with their arm forming a diagonal across their body from their shoulder at one end and their hand on their opposite hip. I'll keep playing it.
2. Could I perhaps trouble you to provide video of what you're talking about - both Craig Jones' set up and your knee slice counter?