75% conviction! Are you planning to short at some stage then?
I do not hold positions and only trade the first 1.5 to 2 hrs of the day, when I do trade

Everyday, I start off with 2 possible trades, a long and a short with stop loss and profit target amounts automatically worked out - as the entry is the KEY I leave that to my own judgement when the market opens, not based on wishey washey analysis.
I may do some trades during the last 1 to 1.5 hr of the day, but it all depends how I feel after my dinner, as I usually eat late and sometimes get a bit lazy after a nice meal.
So, to answer your question, I can and do short any day, it all depends on what happens after the open and how my charts look, as, believe it or not, the charts do not lie, especially for short term trading.
As for the YM shorts, well, let's just say that I think David is not that silly, as his resume shows that he has adequate experience to know what, and what not, to do in the markets. David, may however, have alternative reasons for what he does, but that is entirely his own "business"

