The real question is how you adjust for instances like the one that happened below today with the US30 on the M1 timeframe:
Notice that although Up Down V9 gives us two very long lines of repeated signals for buy and sell trades, we expect this as it's a short-term cycle indicator.
With Up Down V6 we get less of that but the same phenomenon occurs. At least we have a c-value that can be adjusted to have this happening less frequently, but the same cannot be said for V9.
Really goes to show why higher timeframe analysis and c-value adjustment are especially important during trending markets where price keeps on going up or down with no signs of stopping.