I've got a JRB 8x8 tarp, but have been lucky not to have had to use it in any really heavy weather. What's the best pitch for the tarp when it's really rainy, blowing, and just nasty? Tie it down almost vertically and tie the ends together, taco-style? Allow for some ventilation and just get a little wet? BTW: for use w/HH BULA and JRB N'Sniveler UQ. All assistance will be greatly appreciated.