smartone - we have essentially done that with the different length CCIs on the different time frames. The 144 CCI on the 5 min is equivalent to the 48 CCI on the 15 min, but the 144 will give more whips because it is faster. For example, I have seen the 144 go below the +100 for a short, for just one bar, then hook up again (It just happned this morning on ER), while the 48 15 min looks like it never breached the +100. If I had to use just one time frame, I would use the 15 min, and enter the trade at bar close or try entering with 5 minutes left in the bar.
Other than that, I don't have any suggestions.