VXX Short Strategy

I made a spreadsheet where I plot daily VXX returns assuming a 25% core short position.  Then you push more shares into the core for every 20% drop in VXX.  The blue line is the return from initial principle.  The orange line is the maintenance equity for holding that short position.  From the model, it looks like if VXX were to rise about 180% from the avg price entry you would get a margin call assuming a 25% required maintenance margin.