I think you might just be unlucky starting your Old Mas when you did.
Might be my imagination, but the moves seem to be spasmodic; rangey, then sudden moves, rather than any decent trends. when trends come, they seem to be coming later in the day. I could be retrospectively justifying it, but thats my perception.
Your Old Ma system, hopefully was tested over some choppy times as well, because we're not getting 60-70+ runs as much.
dilemma is to either take shorter targets and more trades, as per wackypete and redart, or hold out for 50+, but these might come after several -20 falsies.
looking back, would your trendlines have been better of past 4 weeks?