Whether you double up or not... without an edge and deep pockets, you don't want to use this strategy. But in case you do have an edge and deep pockets (relative to position size, of course), then you AMT http://en.wikipedia.org/wiki/Martingale_(betting_system) lose, lose, lose,lose.... WIN! Edit: sorry, don't know how to post this URL correctly here, just cut and paste the line. D.
Imagine a football game where the offense and defense are lined up on opposite end zones. AMT has the ball on the 50 yd line. He knows his offense is coming up to protect him (this is the key; knowing your team is somewhere behind you) as the defense rushes to pin him down. He doesn't know exactly when his offense will arrive but he knows they are coming. So he backs up toward his own end zone as he patiently waits. Soon enough, his team will arrive to help push the ball forward. Of course fumbles & turnovers are part of the game but with a solid playbook *and practice*, these events are rare and at the end of the day, he's still looking to either turn the ball over midfield or better yet kick the field goal or even score a touchdown. I doubt there is a single person in this thread with even 50% of the experience AMT has in his system, yet people are still criticizing it. Go back to your recliners you arm chair quarterbacks!!
So I am going through different time frames. Weekly, daily, hourly 30 min, 15 min, 5 min and I can't see any trend down. So why are you shorting? Your delta is nothing but a context information. You need to use PA in your entries. What is the logic to sell in a strong up trend that has been going for 3 days? Why not wait for the trend to break down? Are you that sure about your delta zones that you don't need confirmation?
Now at 10:30 I see the first small signs that the up trend might be ending at 921. Short 921.5 stop 923.5 P.S Target TBD P.S2 If this breaks 923.5 again I will get out if I were you.