I've played around with mine_slush for a while now, I wanted to be certain of what I was seeing before I posted again, and I always caught the hop to slush. But what I've seen so far:
1. Hops on if slush is available an backup is on. It seems to have a 10% cutoff for the hop on.
2. Stays there if no prop pools available, but jumps to a prop pool if one comes up.
3. Will hop off and go to normal backup at about 23% total shares.
Still getting over 100% efficiency though - around 100 to 120%
Screenshots below. It starts at 16%, continues to 20%, goes red tries to hop to ozco.in, then finally to bit.pit. You'll also notice it doesn't go back to white (not a selection) until 22%.
Anyone have any ideas?
edit: crap! what i would give for wysiwyg here - getting those images to look ok on the post took forever!