Well, I think the larger time frames hourly and up are going to be the best SG. The smaller time frames just don't hold up as well. I just had what looked to be a perfect short opp on an ECAD 15 minute chart in the tester and it turned into a very bullish one after the COGS repainted.
So large time frames it is. I guess the smaller time frames could be used but the larger COG setting would have to be way up there around 300 to 400 to get a better sampling rate.