Trev,
Except for some trial shots like yesterday, I mostly trade discretionarily the leveraged portion of my robot positions. TNA and TZA have had average intraday/overnight moves of 12% lately and sound risk management policy forces me to discretionarily day trade only those explosive instruments.
On average, since the robots went online, my discretionary trades on unleveraged positions has badly underperformed the robots. The difficulty is that when the robot stays too long in cash and you get bored, you want some action and come back into the pool.
I am still psychologically in a transition phase from discretionary to mechanical trading, but the outstanding outperformance of the mechanical approach is reinforcing my determination to become 100% mechanical ASAP.
Billy