Regarding your observation of it cleaning the water line, I think if you read carefully you will see something about it only coming up out of the water to do that every third time it comes up from the bottom - or something like that. I have seen it do that in my pool and it is normal. I must have missed the part about having the handle in the next to last position, as I have had mine in the last slot and have not noticed any problem.
What do you mean when you talk about wheelies.
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