Walter,
I have found the same pattern as well.
Ym seems more choppy this days. YM will trigger a long one, pull back for few ticks and take off. The only option for me is to widen my SL but the target range is still the same giving me a poor RRR of 1:1.
ES seems more consistent and getting nice movement that can last for few good points. YM is following the ES and has weird pattern sometimes.
And last but not least, if your strategy work for both, volume on ES is just fantastic, you can push easily 50 cars with no slippage.
Sky is be the limit..
I am trading ES with a 237 ticks chart while YM is on 144.
Larry