Best thickness for shaped pizza dough for good sliding from the peel/tray into the oven
Sliding well has nothing to do with weight or thickness, although too thin makes the dough prone to tearing. A generous spread of ground semolina under the pizza dough after shaping will keep it from sticking to your counter while you top it, and in your oven when you bake it. The grainy semolina will act as a barrier, keeping the bottom of your dough off flat surfaces, think of it as natural ball bearings. You can use corn meal as well but I don't like the taste or texture as much. 

As for the ideal thickness of an authentic Neapolitan pizza I've never measured it, but let's just say you can't get the dough any thinner in the center without it tearing. I make mine thin in the middle and just a bit thicker on the outside.