The stuff I do is based on break out/break down actually. The simple fact is, for a stock to move from 50 to 55 intraday, it has to go through 51 52 53 54, and it has to give a few break-outs, they cannot all fail. 9:30-10 tends to be chaotic, but break out/downs out of low volatility pockets are quite reliable after 10am, on the most liquid nasdaq stocks, as nobody has the guts or buying power to manipulate.
During the bear market we had in the past months, momentum was truely great, and entry/exit wasn't that important, you short something blind-folded you make money.. nowadays the stuff is more choppy, the key is DO NOT CHASE.. if you missed the entry, wait for a pull back, roughly I think 70% time there is a pull back after the initial break out, or a mini-squeeze after the initial break down, get the positions filled during that mini correction is very low risk. I can risk 1/4 to 1/2 for potential reward of 1-3 points, and the failure rate is not that high either.