The trick is you haven't learned how to hop the rear wheel up over or almost over the log. it's called "unloading the rear wheel". It's something that you might want to practice when it's not slippery, but the idea is to get all your weight off of the rear wheel before it hits the log, and actually do a bunnyhop over the log as much as you possibly can. It still may slip so what I usually do is pull clutch in some, at the same time I'm jumpin ( in the act of it) so that it doesn't have full power to the rear wheel, then it ( the rear tire ) can kind of grip.
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