Oh man Doug that was coolest race video I've seen in some time! I seem to learn from each of your posts too, the easy way. You are definitely distinct in C-do configuration and one man starting procedure. You Really lay that C'do over to hang way off out of suspension axis. This may have something to do with the Surprise tire lift-let go besides being just wet.
I have studied race and crash video a lot to see examples like yours but on great dry traction, pilot hanging with bike way over, perfectly compensating for fork and rear oscillation and slight traction skip-drift very smoothly when suddenly both tires simply lift off at once into horizontal plane taking him and others out on a tangent. I feel this a basic disadvantage of all moderns, didn't know it could hit on C'do, especially a slide plate tamed one like yours.
When I play on slick turns I have to test slip out traction before the meaner apex loads, then I know w/o surprise when its going to let go and either flat avoid it or be set up to slide with it a bit till straighter/upright. If I'm surprised by much traction loss I crash too. IF I know its coming and can do it on purpose to get the slip-slide out that way so its controllable, then its fun. But its also more aggressive committed method that can go wrong harder.
My sense is hanging off tends to pry tires up on raised CoG as mush as help bike stay over with less steering effort. I have to use hang off on moderns and reflexly stick a knee out in fear feeling bike resisting turning but not on Peel so a mystery yet why the difference, or need to hang off. I think with hanging off you don't have to lean quite as much so may work better in wet or loose stuf - something I've yet to explore much.