I have a similar strategy.... but I short top gainers 
especially those who have a price spike on low volume... most stocks shorted 8:10-8:30 a.m.
if stock gained more than 15% and pre-market volume is, say, below 5% I will 100% stort that stock....
at the same time I "long" top loosers, especially those who dropped too high on relatively low volume...

especially those who have a price spike on low volume... most stocks shorted 8:10-8:30 a.m.
if stock gained more than 15% and pre-market volume is, say, below 5% I will 100% stort that stock....
at the same time I "long" top loosers, especially those who dropped too high on relatively low volume...