Hi adalat
Volatility breakout systems do work on paper, but SB spreads and biasses can erode completely whatever edge you may think you have when it comes to real trades.
But I would say persevere with strict testing before you jump in with large positions. I did try day-trading (before resuming employment - now swing trade) using the early volatility of the FTSE100 and though I was never good at it, there is an early pattern which can be identified appr 2 days out of 3. If first move after 0800 lasts at least 15 mins without correction, there will usually (2 of 3) be a correction and the early trend will then resume and usually (2 of 3) beat its extreme.
So if we open at say 4400 and go up continuously until 0815 or later, say to 4415, watch out for the correction back down. When the correction ends, the index will usuallly break through 4415. But it won't necessarily keep going until 1630, as New York and other factors come into play later. So this little game only works for the first moves of the day. But your 10 points should be there easily. Use tight stops. Good hunting.