I'm sure there is something out there. In fact I think there are devices that aid in this. This used to be pretty good place to start: real goods.

Also consider shading summer trees, of course, other shading objects on location.

Also, During the summer you get longer sun, duh, and the panel's resistance increases when they get hot. Is it better to increase more towards the winter sun normal angle than average to increase winter power and average summer more?

Do you have to worry 'bout snow? What is the angle of repose for a given snowload on a glass surface? Trick question, It changes due to temp. You do want snow to slide off sometime, or be able to wipe it off.

A self moving mount is worth it if more power is worth more than money.

Don't know, our array's angle was determined by the slope of our roof. And is impossible to clean the snow off. You should hear the avalanches off the array after a big sloppy March snow!