Interesting. All I can think of is that for M15 it’s not managing to find strategies because it is simply more difficult for this data, perhaps it’s just more noisy on this timeframe over the last 5 years (which it will be) and harder to predict.
I understand it’s a little unintuitive but it doesn’t mean that there is a mistake really. Worth asking questions but if after checks everything is as it should be then we can only assume it’s just harder to find strategies passing the acceptance criteria on this timeframe.
On the one hand it takes longer to generate strategies for M15 as there are 4x as many bars but then on the other I would have expected that it would have been easier to pass the minimum trade acceptance criteria but it must be struggling with the others.
What other acceptance criteria do you have set? I would leave the minimum count of trades at 300 but relax the other acceptance criteria a little bit so that you get some strategies in the collection and then filter from there.
Much better after an overnight generation to have a couple of hundred strategies in the collection that you can trim down using the performance filter than just have a handful in the collection.