No, the other way around. 40:1 is thicker so it takes more to pull it through the jets, so in turn less goes through. Also as there is more oil in the blend than fuel, every drop that goes through has less fuel in it at 40:1 than 50:1. 40:1 vs 50:1 doesn't sound like much of a difference, but when working with loopers it can be a big difference. I would still stick with the 50:1 mix and check your plugs to make sure you don't have one fouling out or something. Maybe try running your gap at .035.
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