Parchment Questions

I've been using parchment paper for proofing and baking SD loaves on a cookie sheet with rolled dishtowels for lateral support (removed for baking).  

Question one: is the paper reusable? If not, is there a reusable alternative?

Question two: In order to separate the dough from the fabric, I sized the parchment to be as tall as I imagined the loaves could become.  It curled upward and seemed to be blowing in the wind from my convection oven fan. Is this  detrimental to the loaves?